Add responsibility-lane continuity gate for agent recovery

[safal207]

What changed

Adds RLC-001 — Responsibility Lane Continuity, an additive extension to RFC-001 / Verifiable Continuation Envelope.

The extension models recovery of task responsibility topology, not only recovered state:

• explicit responsibility lanes with owner, objective, mutation scope, done condition, latest ruling and durable source refs;
• material VCE event → lane bindings;
• lane-scoped next action;
• source-revalidation restore results;
• fail-closed handling for conflicting lane sources;
• tamper-evident lane and extension digests;
• accepted fixture and a rejected lane-conflation fixture.

Why

A reproducible Codex Desktop compaction case showed that rereading a durable checkpoint and filesystem can still be insufficient: the resumed agent can conflate separate responsibility lanes and continue under the wrong mutation/ownership topology.

RLC-001 makes that failure machine-checkable:

state recovery -> responsibility-lane recovery -> source revalidation -> scoped continuation

Verification

• Local reference suite: 21/21 tests PASS.
• GitHub Actions VCE conformance run examples: add sanitized dynamic support-safety trace fixture #113: SUCCESS, including the new responsibility-lane suite.
• Security workflow on the same head: SUCCESS.

Conformance run:
https://github.com/safal207/pythiaLabs/actions/runs/31861074959

The negative fixture deliberately binds an authoring mutation (artifact-rfc, artifact-schema) to the verification lane, whose scope allows only capability:verify. The validator returns BLOCKED even when the lane restore document otherwise passes.

Compatibility

This is additive. RFC-001 v0.1 and its existing schemas are not modified; RLC-001 composes as an additional gate.

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