follow-up to the deprecations in #406 and #410: 

- fully delete the 5 packages along with their workspace, pyright, and
ADO publish wiring
- refresh the package lists in README, CLAUDE.md, copilot-instructions,
and RELEASE.md.

Co-authored-by: lilydu <[email protected]>
Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>

## Summary

Brings `origin/main` into `release` for the **2.0.12** release. **No
carve-outs this time** — Quoted Replies (PR #321) is included.

`version.json`: `2.0.11` → `2.0.12`.

Aligns with teams.ts/teams.net cadence.

## What's in this release (delta from 2.0.11)

**Features**
- Quoted Replies & new quotes features (#321) — previously held back
- SuggestedActionSubmitActivity for `suggestedAction/submit` invoke
(#434)
- Default targeted replies for targeted inbound messages (#439)
- Reactions API marked GA (#427) — already shipped in 2.0.11 actually,
ignore if duplicate
- Prompt Preview support (#397)
- Sample: opt targeted-messages into slash commands (#430)
- Sample: a2a-in-teams (#401)
- Sample: proactive message update (#405)
- Allow custom HTTP client via `AppOptions` (#416)

**Security & fixes**
- Lock JsonWebToken trust-boundary contract (#432)
- Bump starlette 1.0.0 -> 1.1.0 for PYSEC-2026-161 / BadHost (#441)
- warn when bot starts without credentials (#435)
- fix(apps): support AAD v1 issuers in Entra token validation (#422)
- fix(apps): log inbound activities at info, warn on missing
Authorization (#425)
- fix(http-stream): wait for in-flight flush before sending final close
(#419)
- Mark reactions API as GA and fix sample remove flow (#427)
- Revert serviceUrl allowlist (ADO 5310460) (#415)
- Route `app.get_app_graph` + `ctx.*_graph` to sovereign endpoints via
`cloud.graph_scope` (#402)

**Deprecations / package changes**
- Remove ai, openai, mcpplugin, a2a, and devtools packages (#413)
- Restore and deprecate devtools package (#410)
- Deprecate ai, openai, mcpplugin, a2a packages (#406)
- Add agent framework example, remove chatprompt/mcp client samples
(#386)

**Dependency bumps**
- urllib3 2.6.3 → 2.7.0 (#426)
- python-multipart 0.0.26 → 0.0.27 (#424)
- microsoft-kiota-http 1.9.7 → 1.9.9 (#423)
- idna 3.11 → 3.15 (#431)
- starlette 1.0.0 → 1.1.0 (#441, security)
- /examples/tab/Web: qs, postcss, uuid, follow-redirects bumps

## Quoted Replies inclusion notes

- Teams client rendering is in-sync with the wire format as of
2026-05-06.
- APX QR rollout completed: Public 2026-04-10, GCCH/DoD/Gallatin
2026-04-14.
- Builder methods (`prepend_quote()`, `add_quote()`), `ctx.quote()`, and
the quote-aware `ctx.reply()` behavior are all present in this release.
- `examples/quoting` is included.

## Conflict resolution

The 2.0.11 release branch had the QR-removed shape for four files; took
`main`'s (QR-included) version for all of them:
- `examples/targeted-messages/src/main.py`
- `packages/api/src/microsoft_teams/api/activities/message/message.py`
- `packages/apps/src/microsoft_teams/apps/routing/activity_context.py`
- `packages/apps/tests/test_activity_context.py`

`version.json` conflict resolved to `2.0.12`.

## Test plan

- [x] `uv sync` clean
- [x] `poe check` (ruff format + lint) — clean
- [x] `poe test` — 609 passed
- [x] `pyright` — 0 errors, 0 warnings
- [ ] Pipeline build + test stages green on `release` after merge
- [ ] Publish pipeline run with **Public** → ESRP approval → PyPI
- [ ] `pip install microsoft-teams-apps==2.0.12` smoke install

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: Aamir Jawaid <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>
Co-authored-by: Shanmathi Mayuram Krithivasan <[email protected]>