Add provider-neutral agent feedback workflow

[angusbezzina]

Margin comments can now drive coding-agent edits without a generated inbox or provider integration. A user marks an unresolved thread For agent, then copies one/selected/all comments or lets any shell-capable host read the same local source context through attn feedback and attn feedback --watch.

The implementation adds:

• private, versioned native and browser routing for For-agent marks while preserving human authorship and shared review events;
• Markdown and HTML composer/thread controls plus direct Copy, Copy selected and Copy all actions with file/project scope and clipboard fallback;
• a deterministic feedback projection with stable room/thread/file IDs, ordered conversation, explicit source availability, current anchor resolution, and separate feedback/source revisions;
• offline readable and JSON snapshots from attn feedback [PATH];
• a flushed NDJSON daemon stream from attn feedback --watch [PATH] with complete snapshots, upserts, removals, resets, disconnect errors, and closed-pipe cleanup;
• provider-neutral host instructions, a minimal stream adapter, updated interactive artifact, and implementation evidence.

Agents edit the original source with their existing permissions. Reading, copying, and watching leave the review thread open and never run a model or post a reply. Native marks are available to the local CLI; browser-only marks remain private to that browser. Cross-device mark sync, browser-to-local pairing, and private comments on unshared documents remain outside this change.

Validation:

• cargo fmt --all -- --check
• cargo test --workspace --locked --quiet — all Rust suites passed, including feedback CLI subprocess and review convergence tests
• npm run check in web/ — 0 errors and 0 warnings
• npm test in web/ — all 144 test files passed
• npm run build and npm run build:browser in web/ — passed; existing mixed-import and large-chunk warnings remain
• node --check examples/feedback-watch.mjs
• live disposable-fixture exercises with Codex CLI 0.153.4 and Claude Code 2.1.263: each received a later human revision, edited the bound source, and observed source_changed; provider-free watch delivery measured 209.4 ms

Implementation evidence: planning/collab/agent-feedback-implementation-evidence.md. Beads epic attn-aysu and all 24 leaf tasks are closed and pushed.

[vercel]

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Project	Deployment	Actions	Updated
attn	Ready	Preview	Sep 7, 2026 8:28pm UTC