fix(graph): report uninspected status fields as not inspected

[chiliec]

What

Fixes #204.

When inspectGraphStatus skips immutable inspection — a stranded graph.db-wal, an unreadable sidecar, a containment failure, a failed quick-check or invariant audit — it still filled lastSuccessfulIndexAt, parseHealth and changes with placeholders, and printStatus rendered them in the same shape as measurements: Last successful index: never, Sources: 0 changed, Parse health: 0 ok. All three are false for an intact store.

Why

Per the issue, the JSON contract keeps parseHealth and changes non-nullable (~160 references, invariant checks in read-session.ts), so this is the additive-flag option:

• GraphStatus.inspected?: boolean — optional, additive. graphStatus() defaults it to true; every early return that fills parseHealth with the empty placeholder passes false (15 sites). The GRAPH_INDEX_MISSING path stays true: there is no store, and Sources: N added is a real live-tree measurement there.
• printStatus prints Last successful index: not inspected / Sources: not inspected / Parse health: not inspected when inspected === false; the diagnostic line and Next: remediation are unchanged.
• --json gains "inspected": false on those paths; parseHealth and changes keep their shape.

Text output on the stranded-WAL repro now reads:

Graph status: degraded
Repository: main @ …
Last successful index: not inspected
Sources: not inspected
Parse health: not inspected
WARNING GRAPH_INDEX_SIDECAR_ACTIVE: Graph maintenance or recovery is active (graph.db-wal); immutable inspection was skipped.
Next: mex graph repair

Tests

• src/graph/__tests__/status.test.ts: inspected is false on the corrupt and active-WAL paths, and true (with a real parseHealth.total) once the WAL is checkpointed.
• src/graph/__tests__/cli-graph.test.ts: builds a store, strands a graph.db-wal, runs runGraphStatus and asserts the three not inspected lines, the sidecar warning, no 0 ok/never, and inspected: false under --json.

Both new tests fail on main (expected undefined to be false, expected […] to include 'Last successful index: not inspected') and pass with the change.

Ran locally:

npx vitest run src/graph/__tests__/cli-graph.test.ts src/graph/__tests__/status.test.ts
  Tests  55 passed | 1 skipped (56)
npx vitest run test/graph-integration.test.ts test/graph-cli-freshness.test.ts test/graph-cli-parse-degraded.test.ts src/hub/__tests__/services.test.ts test/reporter.test.ts test/tui.test.ts packages/hub-contracts
  Tests  140 passed | 1 skipped (141)
npx tsc --noEmit  # clean

A full npx vitest run on my box hit the 15 s per-test timeout on unrelated Relay/hub tests under load, so I relied on the targeted runs above plus CI.

Changelog entry added under [0.8.2] → Fixed.

[chiliec]

Note: #213 was opened for the same issue shortly before this one (it was not up when I started on #204). This one keeps the diff to status.ts / cli-graph.ts / the contract type plus tests, and leaves src/drift/index.ts untouched. Happy to close in favour of #213 if you prefer that one.