feat: add bounded nightly SOTA research agent

.github/scripts/nightly-sota/README.md

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+# Nightly SOTA research agent
+
+`nightly-sota-agent.yml` turns recent public research into at most one
+repository issue and, for low-risk topics, one draft offline-prototype pull
+request. It is intentionally not a general-purpose autonomous coding agent.
+
+## Enablement
+
+The committed schedule is `03:17 UTC` every day. Scheduled runs stay disabled
+until both repository settings exist:
+
+1. Actions secret `COGNITUM_NIGHTLY_API_KEY`, issued with only the Cognitum
+   `completions:mid` scope.
+2. Actions variable `RUVIEW_NIGHTLY_SOTA_ENABLED=true`.
+
+The key must not receive guidance-write, evolve, pods, brain, Flywheel-write,
+or administrative scopes. First run the workflow manually in `dry-run` mode;
+that mode only collects a bounded evidence artifact and never reads the secret
+or writes an issue. Manual `live` mode is restricted to the repository owner.
+
+The repository must also allow GitHub Actions to create pull requests. Normal
+branch protection must require at least one approving review and the
+`Verify contributor harness` status check. The publisher requires that exact
+job-name check to be bound to the GitHub Actions app,
+uses GitHub's effective-active-rules endpoint, and stops before prototype
+generation when either requirement is absent. It does not request an
+administrative token to inspect hidden ruleset bypass actors; safety does not
+depend on that metadata because the publisher has no merge or `main`-push path.
+
+## Authority split
+
+| Job | External credential | Repository authority | Result |
+|---|---|---|---|
+| `collect` | none | contents read | Normalized public Cognitum registry and recent arXiv evidence |
+| `propose` | Cognitum completions key | contents read | One schema-checked proposal |
+| `score` | none | contents read | Frozen Darwin digest, completeness score, honest-null Flywheel replay |
+| `issue` | GitHub token | issue write, PR read | One deduplicated issue |
+| `implement` | Cognitum completions key | contents read | Declarative transform and test vectors |
+| `validate` | none | contents read | Schema, template, syntax, claim, path, digest, and replay checks |
+| `publish` | GitHub token | branch/issue/draft-PR/Actions write | One draft PR and an explicit read-only harness-verifier dispatch |
+
+The Cognitum key and a write-capable GitHub token never coexist in one job.
+Model output is never executable code. Repository-owned templates emit the
+prototype module and tests, which this workflow syntax-checks but never runs.
+
+## Hard boundaries
+
+- Public HTTPS sources are fixed to the Cognitum application registry and the
+  arXiv Atom API. Redirects, oversized responses, unexpected media types, and
+  schema drift fail closed.
+- Retrieved text is `CLAIMED`, untrusted evidence. It is quoted inside a fixed
+  trusted prompt and cannot grant authority.
+- The Darwin genome is read-only. Scheduled jobs never invoke Darwin evolution.
+- Flywheel runs a separate committed honest-null canary. A valid canary stays
+  root-only, rejects its candidate, and reports zero verified improvements and
+  no promotion. It does not evaluate the nightly proposal. The workflow's
+  static authority split and artifact gates are what prevent nightly learning
+  or promotion.
+- High-risk topics stop at an issue. This includes production, security,
+  authentication, release/deployment, workflows, dependencies, firmware,
+  hardware, networking, native plugins, HomeKit pairing, and voice protocols.
+- Low-risk model output is a closed transform DSL: bounded scalar test vectors
+  and 1-8 allowlisted operations (`center`, `normalize-peak`, `absolute`,
+  `square`, `difference`, `moving-average`, or `clip`). Local trusted templates
+  emit exactly five `.md`, `.json`, and `.mjs` files below
+  `examples/research-sota/nightly/<fingerprint>/`. Existing files, symlinked
+  parents, dependencies, binaries, executable modes, and more than 400 lines
+  are rejected.
+- Publication is a draft PR. The agent cannot approve, merge, release, promote,
+  or modify the reviewed shared brain.
+
+## Deduplication and failure behavior
+
+The stable fingerprint hashes sorted evidence IDs, finding class, and subsystem.
+Issues and PRs carry an exact hidden marker. Only markers on
+`github-actions[bot]` records with the automation label are trusted for
+deduplication, so copied issue text cannot suppress future runs.
+
+A failure leaves the last completed bounded artifact for seven days. Model,
+protection-preflight, or validation failures may leave an issue without a PR;
+maintainers can inspect the run and decide whether to continue manually. The
+workflow does not retry a failed model call, force-push a branch, close an
+issue, or delete a branch.