fix(extensions): fix lifecycle bugs + comprehensive E2E tests (#1070)

* feat(extensions): unify auth and configure into single entrypoint

Refactors the extension lifecycle to eliminate the divergence between
chat and gateway paths that caused Telegram setup via chat to fail
(missing webhook secret auto-generation, no token validation).

Key changes:
- Rename save_setup_secrets() → configure(): single entrypoint for
  providing secrets to any extension (WasmChannel, WasmTool, MCP).
  Validates, stores, auto-generates, and activates.
- Add configure_token(): convenience wrapper for single-token callers
  (chat auth card, WebSocket, agent auth mode).
- Refactor auth() to pure status check: remove token parameter,
  delete token-storing branches from auth_mcp/auth_wasm_tool,
  rename auth_wasm_channel → auth_wasm_channel_status.
- Add ConfigureResult/MissingSecret types for structured responses.
- Replace hardcoded Telegram token validation with generic
  validation_endpoint from capabilities.json.
- Update all callers (9 files) to use the new interface.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix: use ValidationFailed error variant instead of string matching

Replace brittle msg.contains("Invalid token") checks with a proper
ExtensionError::ValidationFailed variant. configure() now returns
this variant for token validation failures, and callers match on it
directly instead of parsing error message strings.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix: address review — SSRF protection, error typing, missing-secret selection, WS auth

1. SSRF: call validate_fetch_url() before validation_endpoint HTTP request
2. Transport errors map to ExtensionError::Other (not ValidationFailed)
3. configure_token() picks first *missing* secret, not first non-optional
4. WebSocket error path re-emits AuthRequired on ValidationFailed

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* test: add regression tests for extension lifecycle refactoring

- test_configure_token_picks_first_missing_secret: verifies multi-secret
  channels can be configured one secret at a time (commit ce106f4)
- test_auth_is_read_only_for_wasm_channel: verifies auth() has no side
  effects and doesn't store secrets (commit 47f8eb6)
- test_validation_failed_is_distinct_error_variant: verifies the typed
  error variant can be pattern-matched (commit a318161)

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: address review comments — activation dispatch, dead code, caps consolidation

- Fix configure() fallthrough bug: dispatch activation by ExtensionKind
  instead of unconditionally calling activate_wasm_channel() for all
  non-WasmTool types (MCP servers and channel relays now use their
  correct activation methods)
- Remove dead MissingSecret struct and missing_secrets field (never
  populated, flagged by reviewer)
- Consolidate capabilities file parsing in configure(): parse once
  and reuse for allowed names, validation_endpoint, and auto-generation
- Fix auth() doc comment: note MCP OAuth side effects
- Fix stale save_setup_secrets reference in server.rs comment
- Add regression test for activation dispatch bug

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix(extensions): fix 5 extension lifecycle bugs found during E2E testing

Bug fixes in src/extensions/manager.rs:
- Add auth guard to activate_wasm_tool() blocking activation when secrets
  are missing (NeedsSetup), matching activate_wasm_channel() behavior
- Evict WasmToolRuntime module cache on remove() so reinstall uses fresh binary
- Clear activation_errors on remove() for both WasmTool and WasmChannel
- Clean up in-progress OAuth flows on remove() (abort TCP listener, purge
  pending flow entries)

Bug fix in src/channels/web/server.rs:
- Broadcast AuthCompleted SSE event on expired OAuth callback so web UI
  doesn't stay stuck showing "auth required"

E2E test coverage:
- test_wasm_lifecycle.py: 35 tests covering install/configure/activate/
  remove/reinstall lifecycle with regression tests for bugs 1 and 3
- test_extension_oauth.py: 9 tests covering OAuth round-trip flow
- test_tool_execution.py: 5 tests for tool invocation via chat
- test_pairing.py: 4 tests for pairing request lifecycle
- Enhanced conftest.py, helpers.py, mock_llm.py for OAuth mock support

[skip-regression-check]

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix(web): unify extension auth UX and add lifecycle regressions

* test: fix pending oauth flow fixtures after rebase

* test(e2e): fix playwright route ordering for extensions reloads

* test: address e2e review follow-ups

* test: address remaining PR review comments

---------

Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>

.github/workflows/e2e.yml

@@ -52,7 +52,7 @@ jobs:
           - group: features
             files: "tests/e2e/scenarios/test_skills.py tests/e2e/scenarios/test_tool_approval.py"
           - group: extensions
-            files: "tests/e2e/scenarios/test_extensions.py"
+            files: "tests/e2e/scenarios/test_extensions.py tests/e2e/scenarios/test_extension_oauth.py tests/e2e/scenarios/test_wasm_lifecycle.py tests/e2e/scenarios/test_tool_execution.py tests/e2e/scenarios/test_pairing.py"
     steps:
       - uses: actions/checkout@v6