feat: support Django and Jinja language identifiers

[EndlessTrax]

Template files recognized as django-html, jinja, or jinja-html currently have no Python Template Snippets contributions. Add the six missing registrations while preserving all three HTML registrations and all snippet definitions.

Closes #44.

Language ID	General	Jinja	Django
html	Yes	Yes	Yes
django-html	Yes	No	Yes
jinja	Yes	Yes	No
jinja-html	Yes	Yes	No

• package.json: register the existing catalogs under the appropriate language IDs.
• scripts/validate-snippets.js: validate supported, nonempty language IDs, real file paths, duplicate mappings (including normalized paths), required mappings, and framework separation without depending on entry order.
• README.md: document supported modes and the language extensions needed for recognition.

Language IDs were checked against the Django manifest, Jinja manifest, and Better Jinja manifest. VS Code uses manifest language contributions as the default scopes for these catalogs, so existing snippet-level scope values require no changes.

Validation:

• npm ci --cache ../npm-cache: passed using the existing lockfile. A writable cache was needed in this environment. npm reports two existing development dependency advisories; dependencies and lockfile are unchanged.
• npm test: passed; 3 catalogs, 30 prefixes, 9 registrations.
• Deliberately removed each of the nine required registrations: all rejected. Ten additional invalid metadata cases were rejected, including duplicates, normalized duplicate paths, empty/nonstring/unknown language IDs, missing files, directories, wrong framework, null entries, and empty paths. Reversed manifest entry order passed. All mutations restored.
• npx vsce package: passed. The packaged manifest matches the source manifest, and every packaged snippet catalog matches main byte-for-byte.
• git diff --check: passed.
• VS Code 1.141.0 Extension Development Host: programmatic editor tests passed for all four modes, checking all 30 snippet names in each mode (120 availability/exclusion checks), prefix expansion for every applicable snippet using the tab-completion command, and placeholder editing/navigation. Tests ran in an isolated profile with a temporary extension registering the three additional language IDs; no test tooling or dependencies were added to the repository. External language extensions' automatic filename recognition and manual IntelliSense GUI interaction were not tested. Local tooling ran on Node.js 24; PR CI checks Node.js 20.

Relationship to #3: .j2 files benefit when a language extension recognizes them as jinja or jinja-html (or another supported mode). This does not implement arbitrary filename-pattern activation, add language definitions, or override file associations. #3 remains separate and open.

No version bump, release, Marketplace publication, or release tags.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-11T12:14:14.616009Z	d4423ad	PR opened

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[chatgpt-codex-connector]

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Reviewed commit: d4423ad0dc

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[Copilot]

🟡 Changes recommended

Native path normalization makes the new validator fail on Windows.

1 open finding

• Normalize paths to consistent separators before registration comparisons · New

What changed in this PR

Adds snippet support for Django and Jinja language identifiers while preserving HTML behavior.

Changes:

• Registers six additional language/catalog mappings.
• Validates manifest registrations and framework separation.
• Documents supported language modes and recognition requirements.

File	Description
package.json	Registers snippets for Django and Jinja modes.
scripts/​validate-snippets.js	Validates snippet registrations and paths.
README.md	Documents supported modes and extensions.

🧠 Review effort: Balanced

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