chore(repo): ignore local context notes file

[simonhagger]

Summary

• What changed:
  • Added CONTEXT.md to .gitignore.
• Why this change is needed:
  • CONTEXT.md is local collaboration memory and should not be tracked in the shared repository.
• Risk level (low/medium/high):
  • Low

Change Groups

• Docs / Governance:
  • None.
• Frontend / UX:
  • None.
• Desktop Main / Preload / Contracts:
  • None.
• CI / Tooling:
  • Repository ignore rule update only.

Validation

• pnpm nx run contracts:test
• pnpm nx run desktop-main:test
• pnpm nx run renderer:build
• pnpm nx run desktop-main:build
• Additional checks run:
  • Commit hooks (i18n-check, docs-lint, commitlint) passed.

Engineering Checklist

• Conventional Commit title used
• Unit/integration tests added or updated
• A11y impact reviewed
• I18n impact reviewed
• IPC contract changes documented
• ADR added/updated for architecture-level decisions

Security (Required For Sensitive Changes)

IMPORTANT:

• If this PR touches apps/desktop-main/**, apps/desktop-preload/**, libs/shared/contracts/**, .github/workflows/**, or docs/02-architecture/security-architecture.md, the two items below MUST be checked to pass CI.

• Security review completed

• Threat model updated or N/A explained

Security Notes

• Threat model link/update:
  • Not applicable for ignore-rule only change.
• N/A rationale (when no threat model update is needed):
  • This change only prevents local non-product context file tracking.