bruno: replace Python generator with Go golden-writer in the drift test

The generator moves into the Go toolchain per repo preference:
internal/docs/bruno_gen.go emits the OpenCollection mirrors (same output
contract — gate-verified example-request bodies, env-var params,
device-token headers, login/register/refresh token-capture scripts) and
TestBrunoMirrorsDocs grows a -update flag: verification by default,
regeneration on demand:

  go test ./internal/docs -run TestBrunoMirrorsDocs -update

Generator and checker are now the same code — they cannot drift apart.
scripts/gen_bruno_from_docs.py deleted; opencollection.yml README points
at the go-test command.

Also fixed vs the Python pass: mirror placement follows the docs tree
folder (RelPath), not the area frontmatter (several docs — highlights,
notes, ratings, users, progress — carry a different area); docs blocks
emit the collection's mapping form (content + type), not a bare scalar;
JSON body sanity is checked at generation time.

Idempotent: back-to-back -update runs are byte-identical.
make test green (9 pkgs).

bruno/libraries/add_library_folder.yml

@@ -19,9 +19,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Add Library Folder
+docs:
+  content: |-
+    # Add Library Folder
 
-  `POST /api/libraries/:id/folders` — auth: jwt+admin.
+    `POST /api/libraries/:id/folders` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/add_library_folder.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/add_library_folder.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/browse-folders.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Browse Library Folders
+docs:
+  content: |-
+    # Browse Library Folders
 
-  `GET /api/libraries/browse` — auth: jwt+admin.
+    `GET /api/libraries/browse` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/browse-folders.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/browse-folders.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/create_library.yml

@@ -21,9 +21,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Create Library
+docs:
+  content: |-
+    # Create Library
 
-  `POST /api/libraries` — auth: jwt+admin.
+    `POST /api/libraries` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/create_library.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/create_library.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/delete_library.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Delete Library
+docs:
+  content: |-
+    # Delete Library
 
-  `DELETE /api/libraries/:id` — auth: jwt+admin.
+    `DELETE /api/libraries/:id` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/delete_library.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/delete_library.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/delete_library_folder.yml

@@ -19,9 +19,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Delete Library Folder
+docs:
+  content: |-
+    # Delete Library Folder
 
-  `DELETE /api/libraries/:id/folders` — auth: jwt+admin.
+    `DELETE /api/libraries/:id/folders` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/delete_library_folder.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/delete_library_folder.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/delete_processing_issue.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Delete Processing Issue
+docs:
+  content: |-
+    # Delete Processing Issue
 
-  `DELETE /api/libraries/:id/issues/:issueId` — auth: jwt+admin.
+    `DELETE /api/libraries/:id/issues/:issueId` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/delete_processing_issue.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/delete_processing_issue.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_library.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Library Details:<|end|><|start|> assistant to=edit<|channel|>analysis <|constrain|>xml<|message|><rfl:parameter name="path">
+docs:
+  content: |-
+    # Get Library Details:<|end|><|start|> assistant to=edit<|channel|>analysis <|constrain|>xml<|message|><rfl:parameter name="path">
 
-  `GET /api/libraries/:id` — auth: jwt+admin.
+    `GET /api/libraries/:id` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/get_library.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_library.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_library_folders.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Library Folders
+docs:
+  content: |-
+    # Get Library Folders
 
-  `GET /api/libraries/:id/folders` — auth: jwt+admin.
+    `GET /api/libraries/:id/folders` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/get_library_folders.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_library_folders.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_library_media_items.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Library Media Items
+docs:
+  content: |-
+    # Get Library Media Items
 
-  `GET /api/libraries/:id/media-items` — auth: jwt+admin.
+    `GET /api/libraries/:id/media-items` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/get_library_media_items.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_library_media_items.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_library_stats.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Library Statistics
+docs:
+  content: |-
+    # Get Library Statistics
 
-  `GET /api/libraries/:id/stats` — auth: jwt+admin.
+    `GET /api/libraries/:id/stats` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/get_library_stats.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_library_stats.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_library_types.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Library Types
+docs:
+  content: |-
+    # Get Library Types
 
-  `GET /api/libraries/types` — auth: none.
+    `GET /api/libraries/types` — auth: none.
 
-  Canonical reference: `docs/developer/api/libraries/get_library_types.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_library_types.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_processing_issue_stats.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Processing Issue Stats
+docs:
+  content: |-
+    # Get Processing Issue Stats
 
-  `GET /api/libraries/:id/issues/stats` — auth: jwt+admin.
+    `GET /api/libraries/:id/issues/stats` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/get_processing_issue_stats.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_processing_issue_stats.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_scan_settings.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Scan Settings
+docs:
+  content: |-
+    # Get Scan Settings
 
-  `GET /api/libraries/scan-settings` — auth: jwt+admin.
+    `GET /api/libraries/scan-settings` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/get_scan_settings.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_scan_settings.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/get_visible_libraries.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Get Visible Libraries
+docs:
+  content: |-
+    # Get Visible Libraries
 
-  `GET /api/libraries/visibility` — auth: jwt.
+    `GET /api/libraries/visibility` — auth: jwt.
 
-  Canonical reference: `docs/developer/api/libraries/get_visible_libraries.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/get_visible_libraries.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/list_libraries.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # List Libraries (Admin)
+docs:
+  content: |-
+    # List Libraries (Admin)
 
-  `GET /api/libraries` — auth: jwt+admin.
+    `GET /api/libraries` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/list_libraries.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/list_libraries.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/list_processing_issues.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # List Processing Issues
+docs:
+  content: |-
+    # List Processing Issues
 
-  `GET /api/libraries/:id/issues/list` — auth: jwt+admin.
+    `GET /api/libraries/:id/issues/list` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/list_processing_issues.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/list_processing_issues.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/resolve_processing_issue.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Resolve Processing Issue
+docs:
+  content: |-
+    # Resolve Processing Issue
 
-  `POST /api/libraries/:id/issues/:issueId/:mediaItemId/resolve` — auth: jwt+admin.
+    `POST /api/libraries/:id/issues/:issueId/:mediaItemId/resolve` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/resolve_processing_issue.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/resolve_processing_issue.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/scan_library.yml

@@ -13,9 +13,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Scan Library
+docs:
+  content: |-
+    # Scan Library
 
-  `POST /api/libraries/:id/scan` — auth: jwt+admin.
+    `POST /api/libraries/:id/scan` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/scan_library.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/scan_library.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/set_library_visibility.yml

@@ -20,9 +20,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Set Library Visibility
+docs:
+  content: |-
+    # Set Library Visibility
 
-  `POST /api/libraries/visibility` — auth: jwt.
+    `POST /api/libraries/visibility` — auth: jwt.
 
-  Canonical reference: `docs/developer/api/libraries/set_library_visibility.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/set_library_visibility.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/update_library.yml

@@ -20,9 +20,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Update Library
+docs:
+  content: |-
+    # Update Library
 
-  `PUT /api/libraries/:id` — auth: jwt+admin.
+    `PUT /api/libraries/:id` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/update_library.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/update_library.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown

bruno/libraries/update_scan_settings.yml

@@ -20,9 +20,11 @@ settings:
   followRedirects: true
   maxRedirects: 5
 
-docs: |-
-  # Update Scan Settings
+docs:
+  content: |-
+    # Update Scan Settings
 
-  `PUT /api/libraries/scan-settings` — auth: jwt+admin.
+    `PUT /api/libraries/scan-settings` — auth: jwt+admin.
 
-  Canonical reference: `docs/developer/api/libraries/update_scan_settings.md` (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, not this file.
+    Canonical reference: docs/developer/api/libraries/update_scan_settings.md (docs site → Developer → API). This request is GENERATED from that doc; edit the doc, then run the drift test with -update.
+  type: text/markdown