feat(devin-desktop): rename Windsurf→Devin Desktop + fix(continue) thread-safe adapter

[DK09876]

This PR bundles two things (per request, kept in one PR):

1. Rename Windsurf → Devin Desktop

Cognition rebranded Windsurf to Devin Desktop (June 2026); Cascade is EOL July 1. Since hindsight-windsurf was merged but never published, renamed it to devin-desktop before first release.

• Package hindsight-windsurf → hindsight-devin-desktop (module, CLI, DevinDesktopConfig, bank devin-desktop, HINDSIGHT_DEVIN_DESKTOP_BANK_ID)
• Rule now writes to .devin/rules/hindsight.md (preferred path); MCP config stays ~/.codeium/windsurf/mcp_config.json (Devin's data dir, unchanged by rebrand)
• Official Devin logo; docs + integrations.json + README refreshed; all registries updated
• 26 unit tests + gated E2E pass; real-app smoke verified

2. fix(continue): resolve a fresh Hindsight client per request

Found via a real in-editor VS Code test. The Continue adapter runs on a ThreadingHTTPServer (one thread per request) but shared a single Hindsight client. The client's aiohttp session is thread/loop-bound, so the first @hindsight recall worked and every one after threw Timeout context manager should be used inside a task — Continue then showed an error context item and the model answered with no memory.

• Resolve the client per request (test-injected clients still used as-is)
• Close per-request clients in a finally so the fresh aiohttp session doesn't leak a connector each call
• Bump hindsight-continue → 0.1.1 (the published 0.1.0 has this bug)
• Adds a regression test asserting per-request resolution across the threaded server

Verified live: 5 recalls in a row all succeed; 0 timeout errors; 0 unclosed-connector warnings. 17 continue tests pass; ruff clean.

🤖 Generated with Claude Code

[benfrank241]

Reviewed — the code looks good, and none of the red CI is from this diff (it touches only integrations + docs + test.yml). Breaking the failures down:

• test-rust-cli, build-rust-cli-arm64, test-doc-examples (cli), verify-generated-files — pre-existing breakage on main, not this PR: mental_model.rs is missing the new refresh_cron field on MentalModelTriggerInput, and two API test files have ruff-format drift. Fixed in fix(ci): unblock main — ruff format drift + CLI refresh_cron field #2427 — once that merges and CI re-runs, these clear.
• Core LLM tests / LLM acceptance — real-LLM judge flakiness (2 failed / 88 passed: a fact missing its absolute date, and a reflect that answered in English instead of Chinese). Not related to the rename.
• test-api, test-embed-windows — flaky/infra; this PR changes no API or embed code. They only ran here because editing test.yml triggers the full suite (they were skipped on integration-only PRs).

On the actual changes:

• fix(continue) is a genuine bug fix and well-handled — resolving a fresh client per request is the right call given ThreadingHTTPServer + the thread/loop-bound aiohttp session, the per-request client is closed in finally (injected clients left alone), and the regression test drives multiple requests through the threaded server. 👍
• The Windsurf→Devin Desktop rename is large but mechanical and the registries line up (check-integrations is green).

No code changes needed here. Recommend merging #2427 first, then a re-run. One sequencing note: #2417 defers a doc note until this lands, so #2410 should merge before #2417.