Update App Manifest version to v1.26

[Copilot]

Bumps the Teams App Manifest schema from v1.25 → v1.26 across all templates and the manifest package. v1.26 adds an optional features array to the description property (NON-BREAKING).

Changes

Templates (123 files)

• Updated manifestVersion and $schema URL to v1.26 in all 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 (sourced from microsoft/json-schemas@97d2ee1)
• Generated src/generated-types/teams/TeamsManifestV1D26.ts via npm run convert
• Updated src/generated-types/index.ts:
  • Added TeamsManifestV1D26 to the TeamsManifest union type
  • Updated TeamsManifestLatest alias from v1.25 → v1.26
  • Added "1.26" converter entry to TeamsManifestConverterMap

packages/mcp-server

• Updated latestVersion for app_manifest from "v1.25" → "v1.26" in fetcher.ts and the corresponding test

v1.26 description.features schema

"description": {
  "short": "...",
  "full": "...",
  "features": [            // optional; 1–3 items
    {
      "title": "...",      // max 45 chars
      "description": "..." // max 120 chars
    }
  ]
}

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: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (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)