docs(vrs): restore the strict validation gate

[schickling-assistant]

Problem

axe vrs check --profile strict docs/vrs failed on main: stale local line anchors, obsolete decision links, HTML-only field anchors, and historical ledger records that predated the enforced decision/delta/experiment shapes.

Goal

Restore the strict VRS gate on main before the dependent ledger-ID hygiene change is validated.

Decisions

• Replaced unstable local #L… links with file-level links; source line numbers are not stable Markdown anchors.
• Converted Agent Spec field rules from explicit HTML headings to ordinary Markdown headings and updated every field lookup to the generated slug.
• Preserved historical record content while mapping it into the checker’s required decision, delta, and experiment sections.
• Pointed the obsolete DING decision link at the accepted 0001-ding-harness-dispatch-is-positional-and-harness-owned record.

Verification

• axe vrs check --profile strict docs/vrs — axe vrs check: ok
• CARGO_BUILD_JOBS=8 nix build .#st2 --no-link -L — exit 0; Nix checkPhase passed, including 741 library tests (1 ignored) and integration tests.

Complexity

No new code or runtime complexity; documentation and ledger-shape repair only.

Concerns

File-level source links are less precise than stale line fragments, but remain valid across source movement. Stable symbol anchors would require a different documentation surface.

Friction & bottlenecks

The repair build fetched a cold Rust dependency closure before running the gate. No persistent tooling defect encountered.

Follow-ups

None.

References

Prerequisite for the VRS ledger-ID hygiene PR.

Posted on behalf of @schickling

field	value
agent_identity	dev3.direct.omp.43sz6ujq
session	dev3.43sz6ujq
agent_persona	generalist
agent_supervisor	unavailable
agent_tool	OMP
agent_tool_version	18.1.7
agent_runtime	OMP 18.1.7
tooling_profile	dotfiles@39a19af