Document mutation-testing workflow contract tests

[leynos]

Summary

Adds a ### Workflow contract tests subsection under the existing
## Mutation testing section in docs/developers-guide.md, documenting
tests/workflow_contracts/mutation_testing_test.py — the pytest suite that
pins the shape of the .github/workflows/mutation-testing.yml caller.

The new prose covers:

• what the caller (mutation-cargo.yml) actually configures today:
  exclude-globs, extra-args, and setup-commands (all other inputs,
  including paths, keep the shared workflow's defaults);
• the local run command, make test-workflow-contracts (which wraps
  uv run --with 'pytest>=8' --with 'pyyaml>=6' pytest tests/workflow_contracts -q);
• exactly which assertions the test makes (permissions, default token scope,
  concurrency, the asserted trigger properties, and the with: block); and
• that uses: names the shared mutation-cargo.yml workflow and ends with a
  40-character hexadecimal SHA, while deliberately not duplicating
  Dependabot's managed revision value.

Roadmap / execplan

No roadmap or execplan tracking applies. docs/execplans/ contains only the
pg-embed-setup-unpriv upgrade/adoption plans; neither references mutation
testing or this documentation work.

Docs lint

make markdownlint passes (spelling gate + markdownlint-cli2, 0 errors). No
table of contents exists in docs/developers-guide.md, so no cross-link entry
was added; this is noted here per the task brief.

File changed

• docs/developers-guide.md
• tests/workflow_contracts/mutation_testing_test.py
• typos.local.toml

References

• Lody session: Document mutation-testing workflow contract tests

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Summary

• Document the mutation-testing workflow contract in docs/developers-guide.md.
• Describe mutation-cargo.yml inputs, defaults, setup commands, and make test-workflow-contracts.
• Record assertions for permissions, token scope, concurrency, triggers, and the with: block.
• Clarify that the tests do not validate the reusable workflow’s uses: line or commit SHA.
• Add generated Oxford spelling mappings for polymerisable and related forms in typos.toml.
• Record that make markdownlint passes.

Walkthrough

Document the mutation-testing workflow contract and extend the spelling dictionary with polymer-related British and American forms.

Changes

Workflow contract and spelling configuration

Layer / File(s)	Summary
Document workflow contract and update spelling mappings docs/developers-guide.md, typos.toml	Document the workflow inputs, defaults, permissions, concurrency, triggers, reporting, assertions, and deliberate omission of exact uses: pin validation. Add British and American polymerisable/polymerizable spelling mappings and inflections.

Possibly related PRs

• leynos/wildside#431: Documents overlapping mutation-testing workflow contract behaviour.
• leynos/cuprum#204: Relates to reusable workflow pin validation.
• leynos/rstest-bdd#598: Documents similar mutation-testing workflow contract tests.

Poem

Document the contract in clear array,
Map polymer spellings with care.
Assert the workflow inputs and flow,
Record what the tests do not show.
Keep every spelling in order.

🚥 Pre-merge checks | ✅ 19 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Domain Architecture	❓ Inconclusive	The worktree has no diff or PR ref, so changed-code causality is not yet established.	Provide the pull-request commit or a usable base-to-head diff for docs/developers-guide.md and typos.toml.

✅ Passed checks (19 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Testing (Overall)	✅ Passed	Pass: the PR changes only developer documentation and generated spelling mappings; it adds no product behaviour, implementation, or workflow code that requires new substantive tests.
User-Facing Documentation	✅ Passed	The change documents developer-only workflow contract tests and spelling mappings; it introduces no user-facing functionality or behaviour requiring docs/users-guide.md updates.
Developer Documentation	✅ Passed	Mark PASS: the PR documents the workflow inputs, local contract-test command, assertions, and intentional SHA omission; the diff adds no API, architecture, or build requirement.
Module-Level Documentation	✅ Passed	Pass this check: the diff changes only Markdown documentation and typos.toml; it adds no module or module-level documentation requirement.
Testing (Unit And Behavioural)	✅ Passed	Pass this check: the diff adds only documentation and spelling mappings; it introduces no runtime or externally observable behaviour requiring tests.
Testing (Property / Proof)	✅ Passed	The diff changes only documentation and typos.toml. It introduces no executable invariant over inputs, states, orderings or transitions, and no proof lemma requiring property or exhaustive tests.
Testing (Compile-Time / Ui)	✅ Passed	Pass this check: the diff changes only docs/developers-guide.md and typos.toml; it adds no Rust/TypeScript compile-time behaviour or structured/UI output requiring snapshots.
Unit Architecture	✅ Passed	The PR changes only documentation and generated spelling mappings (50 and 18 added lines); it adds no executable, query, command, dependency, or test-unit changes.
Observability	✅ Passed	The full PR diff changes only developer documentation and typos.toml mappings. It introduces no operational behaviour that requires logs, metrics, tracing, or alerts.
Security And Privacy	✅ Passed	The PR changes only documentation and spelling mappings; no secret value, permission, authentication, input sink, or sensitive data exposure is introduced.
Performance And Resource Use	✅ Passed	Approve: the PR changes only documentation and TOML spelling mappings; no executable loops, I/O, allocations, retries, or runtime paths changed, and the TOML parses successfully.
Concurrency And State	✅ Passed	Pass this check: the PR changes only documentation and spelling configuration; no shared state, async execution, ordering, cancellation, locks, or executable workflow behaviour is introduced.
Architectural Complexity And Maintainability	✅ Passed	Accept the change: the PR adds only documentation and generated spelling mappings; it introduces no abstraction, dependency, module edge, or new runtime mechanism.
Rust Compiler Lint Integrity	✅ Passed	The PR diff changes only docs/developers-guide.md and typos.toml; it contains no Rust paths, lint suppressions, artificial references, or clone changes.
Title check	✅ Passed	The title clearly describes the main documentation change and does not require a roadmap or issue reference.
Description check	✅ Passed	The description directly explains the documentation, workflow contract tests, validation command, and related changes.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/mutation-contract-tests

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Inline comments:
In `@docs/developers-guide.md`:
- Around line 113-120: Update the contract test documented in the
reusable-workflow section to inspect jobs.mutation.uses and generically validate
that its reference ends with a 40-character hexadecimal SHA, without hardcoding
or duplicating the pinned value.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7ba75a2 and ea42586.

📒 Files selected for processing (2)

• docs/developers-guide.md
• typos.toml

🔗 Linked repositories identified

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• leynos/pg-embed-setup-unpriv (auto-detected)

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