Grade every catalog lane; record ADR-0007

Closes the RISK-F-0003 exposure. All 14 ungraded lanes now carry an explicit
risk grade with its justification in the entry: 17 high, 10 standard, 0
ungraded. The agent read-boundary now fires (exit 7) on lanes that were silently
outside it.

Graded on merit rather than defensively. A first pass marked two ordinary
internal workload secrets high; test_high_risk_lanes_classified asserted the
opposite and was right, so both were regraded down. high means disclosure into a
logged context is damaging beyond what rotation recovers. inter-hub-bootstrap-ssh
is high conservatively, with the reason in the entry so it is regraded with
evidence rather than assumed down.

ADR-0007 records the rule the grading rests on: build-stage permissiveness
applies to controls that gate work, not to controls that prevent credential
disclosure. The test is friction, not severity — the read-boundary blocks nobody,
since --out/--exec/--wrap remain available, so relaxing it buys nothing. A
blocked operation is recovered by retrying; a credential in a logged transcript
is not recovered by rotation.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/adr/README.md

@@ -68,3 +68,4 @@ and the publication is a defect.
 | `ADR-0004` | High-risk lanes refuse raw value streaming to agent sessions | ops-warden, and any agent runtime calling `warden access` |
 | `ADR-0005` | Implement one lane narrowly, route everything else | ops-warden |
 | `ADR-0006` | Enforcement is zone-scoped, never a global flag | ops-warden |
+| `ADR-0007` | Build-stage permissiveness stops at credential disclosure | ops-warden |