docs: repair references that no longer resolve

[wseaton]

Six backticked source-file references in the docs drifted when the files
they named were moved into crate subdirectories. Each had exactly one
matching path in the current tree.

Repaired references

Document	Line	Before	After
docs/crucible-contract.md	759	ps.rs	crucible/src/ps.rs
docs/crucible.md	156	vcs.rs	crucible-vcs/src/vcs.rs
docs/crucible.md	163	publish.rs	crucible/src/publish.rs
docs/crucible.md	166	init.rs	crucible/src/init.rs
docs/crucible.md	166	check.rs	crucible/src/check.rs
docs/crucible.md	166	scope.rs	crucible-contract/src/scope.rs

Left for a human

These references have zero or multiple candidates; picking the right target requires
judgment about authorial intent.

Document	Line	Reference	Reason
docs/codex-harness.md	92	auth.json	no candidates
docs/codex-harness.md	93	auth.json	no candidates
docs/crucible-contract.md	15	crucible.toml	3 candidates
docs/crucible-contract.md	90	crucible.toml	3 candidates
docs/crucible-contract.md	122	workflow.star	3 candidates
docs/crucible-contract.md	124	workflow.star	3 candidates
docs/crucible-contract.md	124	crucible.toml	3 candidates
docs/crucible-contract.md	188	workflow.star	3 candidates
docs/crucible-contract.md	268	workflow.star	3 candidates
docs/crucible-contract.md	284	RESULTS.md	no candidates
docs/crucible-contract.md	365	PLAN_TASK_RESULT.json	no candidates
docs/crucible-contract.md	392	control.json	no candidates
docs/crucible-contract.md	393	STEER.md	no candidates
docs/crucible-contract.md	393	manifest_dir/STEER.md	no candidates
docs/crucible-contract.md	394	ESCALATION.json	no candidates
docs/crucible-contract.md	397	crucible.toml	3 candidates
docs/crucible-contract.md	527	RESULTS.md	no candidates
docs/crucible-contract.md	713	STEER.md	no candidates
docs/crucible-contract.md	722	crucible.toml	3 candidates
docs/crucible-contract.md	739	crucible.toml	3 candidates
docs/crucible-contract.md	750	SCOPE.md	no candidates
docs/crucible-contract.md	753	SCOPE.md	no candidates
docs/crucible.md	12	crucible.toml	3 candidates
docs/crucible.md	155	session.rs	2 candidates
docs/crucible.md	156	RESULTS.md	no candidates
docs/crucible.md	157	STEER.md	no candidates
docs/crucible.md	157	state/control.json	no candidates
docs/crucible.md	157	ESCALATION.json	no candidates
docs/crucible.md	159	deploy/profile.rs	2 candidates
docs/crucible.md	159	deploy/render/kube.rs	2 candidates
docs/crucible.md	165	selftest.rs	2 candidates
docs/crucible.md	166	SCOPE.md	no candidates
docs/crucible.md	167	preflight.rs	2 candidates
docs/crucible.md	235	crucible.toml	3 candidates
docs/crucible.md	239	method.md	3 candidates
docs/crucible.md	257	crucible.toml	3 candidates
docs/crucible.md	319	RESULTS.md	no candidates
docs/crucible.md	369	crucible/src/manifest.rs	no candidates

[github-actions]

Docs preview for this PR is built and attached as the docs-preview artifact.

Download docs-preview, unzip, and open index.html in a browser.

Rebuilt for 2eaadd7.

[wseaton]

Opened by a docs-drift playbook run using a credential from the secrets registry. Companion: #93.