feat: leveled response views + --level knob with snapshot digest — Phase 4

[thymikee]

What

The core of Phase 4's token win: a leveled response system. A responseLevel knob — digest | default | full — behind a global --level flag (mirroring --cost), with a per-command ResponseView registry applied in the router on the success path.

The headline view: snapshot digest collapses the full node tree (the dominant token sink for agents) to { nodeCount, refs: first 12 hittable/non-occluded refs with labels } plus the cheap top-level signals.

agent-device snapshot --level digest   # token-cheap; just counts + actionable refs
agent-device snapshot                  # default — byte-identical to today

Invariant (Maestro-safe)

With responseLevel default (or unset) AND no registered view AND no --cost, the router returns the original response object untouched — byte-identical to today, so the Maestro .ad recompare path is unaffected. Views and cost are purely additive and compose (cost computed from the original node tree, so cost.nodeCount stays accurate even after a digest).

Changes

• src/contracts.ts: RESPONSE_LEVELS/ResponseLevel, meta.responseLevel, boundary-schema whitelist. Plumbing mirrors --cost end to end (cli-flags FlagDefinition + GLOBAL_FLAG_KEYS, AgentDeviceClientConfig + overrides, buildClientConfig, buildMeta). ResponseLevel exported from the public root.
• src/daemon/response-views.ts (new): the ResponseView registry, seeding the snapshot digest. full returns today's shape (nothing richer is computed yet).
• src/daemon/request-router.ts: applyResponseLevelView + applyAgentCostGrafts on the success path — composes cleanly with the existing cost block.

Tests

• response-views.test.ts: the snapshot view — digest filters to hittable === true && interactionBlocked !== 'covered', drops the tree, keeps truncated/visibility/snapshotQuality; default/full are reference-identical passthroughs.
• request-router-response-level.test.ts: the router graft via an injected test view — (a) default identity is JSON.stringify-identical to no-meta, (b) digest applies, (c) full passthrough, (d) digest + --cost composition, (e) unregistered command + digest is byte-identical, (f) responseLevel survives boundary parse.

Verification

• tsc --noEmit 0; oxfmt + oxlint --deny-warnings clean; fallow audit --base origin/main clean; rslib build 0; Layering Guard empty
• vitest daemon/contracts/client → 111 files / 1106 tests pass (incl. the existing cost/typed-error grafts after the router restructure)

Scope / follow-ups (Phase 4 workstreams)

• This is WS1 (the core + snapshot digest). Sibling PR feat: per-command MCP outputSchema — Phase 4 #941 adds per-command MCP outputSchema (independent).
• Deferred: more digest views (screenshot overlayRefs, the single-node find/get family); the typed batch-step digest (WS4, rides on this); MCP responseLevel exposure (held back to avoid colliding with feat: per-command MCP outputSchema — Phase 4 #941's command-tools.ts edits); and the zero-load fast-path generalization (sensitive routing — better as a focused follow-up).

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	1.4 MB	1.4 MB	-1.9 kB
JS gzip	453.3 kB	452.8 kB	-515 B
npm tarball	558.5 kB	557.2 kB	-1.3 kB
npm unpacked	2.0 MB	2.0 MB	-5.0 kB

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	25.7 ms	25.1 ms	-0.7 ms
CLI --help	44.5 ms	43.3 ms	-1.2 ms

Top changed chunks:

Chunk	Raw diff	Gzip diff
dist/src/9722.js	+599 B	+230 B
dist/src/2948.js	+77 B	+75 B
dist/src/cli.js	+30 B	+10 B

[thymikee]

Current head 08b715d is blocked by CI. Integration Tests fail in pnpm test:integration:progress:check because the new public CLI flag responseLevel is unclassified by scripts/integration-progress.ts:

provider-backed integration progress check failed: unclassified public CLI flags: responseLevel

Please add responseLevel to the appropriate progress-script coverage bucket, likely the config/output/diagnostics/transport bucket if it is an output-shaping flag, or another explicit owner if the PR intends different coverage. The rest of the completed checks are green.

[thymikee]

Reviewed current head 1389c40 against Phase 4 and the shipped command path. The previous CI blocker is fixed and all 21 checks are green, but I found one blocker before this can be ready.

--level digest is applied in the daemon, but the snapshot client path appears to normalize the digest back into an empty default-shaped snapshot before CLI output. src/daemon/response-views.ts returns the intended digest shape { nodeCount, refs, ... } with no nodes array. Then client.capture.snapshot() still routes the daemon result through normalizeSnapshotResult, which reads data.nodes via readSnapshotNodes; without nodes, that becomes [], and the later snapshot serializer emits { nodes: [], truncated: ... } rather than the digest refs/count.

That means the advertised token-cheap agent-device snapshot --level digest shape is not what CLI users get through the production command surface. The tests cover the raw daemon view and a mocked router view, but not the real snapshot client/CLI path, so this regression can pass green CI. Please either preserve digest-shaped snapshot responses through the client/output layer or add a response-level-aware output path, plus a test that exercises real snapshot command output for responseLevel: digest / --level digest.