chore: Update App Manifest version to v1.26

[Copilot]

Bumps Teams App Manifest schema from v1.25 to v1.26 across all templates and supporting packages, incorporating schema changes to description, composeExtensions, and copilotAgents.

Changes

• Templates — Updated $schema URL and manifestVersion field in all 123 manifest.json.tpl / manifest.local.json.tpl files across templates/vsc, templates/vs, and templates/unused

• packages/manifest

  • Added src/json-schemas/teams/v1.26/MicrosoftTeams.schema.json
  • Generated src/generated-types/teams/TeamsManifestV1D26.ts via npm run convert
  • Updated src/generated-types/index.ts: added TeamsManifestV1D26 to imports, exports, union type, and converter map; updated TeamsManifestLatest alias to point to v1.26

• packages/mcp-server — Updated latestVersion for app_manifest schema type to "v1.26" in fetcher.ts and corresponding test

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• developer.microsoft.com
  • Triggering command: /usr/bin/curl curl -s -o /tmp/MicrosoftTeams.v1.26.schema.json REDACTED (dns block)
  • Triggering command: /opt/hostedtoolcache/node/24.14.1/x64/bin/node /opt/hostedtoolcache/node/24.14.1/x64/bin/node --no-experimental-strip-types /home/REDACTED/work/microsoft-365-agents-toolkit/microsoft-365-agents-toolkit/packages/manifest/node_modules/mocha/lib/cli/cli.js test/**/*.test.ts --no-timeout --require ts-node/register --no-config --no-package --diff --extension js --extension cjs --extension mjs --reporter spec --slow 75 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

workitem

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.99%. Comparing base (f3a5ce9) to head (34bca03).
⚠️ Report is 32 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #15672      +/-   ##
==========================================
+ Coverage   92.93%   92.99%   +0.06%     
==========================================
  Files         623      623              
  Lines       38443    38539      +96     
  Branches     6985     6985              
==========================================
+ Hits        35727    35840     +113     
+ Misses       1984     1959      -25     
- Partials      732      740       +8     

Files with missing lines	Coverage Δ
packages/mcp-server/src/fetcher.ts	100.00% <ø> (ø)

... and 12 files with indirect coverage changes

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