fix(ooda): declarative standing seed goals + warm-board self-heal (#4927)

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Problem (#4927 / #4930 / #4934, root-caused in #4935)

The standing goal articulate-repo-hygiene-backlog was re-parked every OODA cycle and fed the goal stuck after guided retry (UNCLEAR-CRITERIA) issue storm — purely because it was never tagged perpetual. The no-progress breaker's !is_perpetual() exemption therefore never fired for it, so a genuinely perpetual/standing goal was treated as a convergence-required goal that churned the escalation loop.

Fix

Close the gap at the seed-declaration + reconcile surface, reusing the single existing ActiveGoal::is_perpetual() predicate (no second notion of "perpetual"):

• Declarative standing: bool (default false) on SeedGoal with a .standing() builder, and on TomlSeedGoal via #[serde(default)] while keeping deny_unknown_fields (a typo'd flag still fails loud).
• Carry standing through the identity file_loader conversion.
• seed_board_from_seed_goals marks a standing seed perpetual at cold-start; ordinary seeds are pushed unchanged (no reclassification).
• reconcile_standing_markers: idempotent load-time self-heal that stamps the standing marker onto already-persisted goals matching a standing seed's normalized title slug (exact slug match only, never fuzzy prose), fixing the live warm-board goal. Wired into the OODA cold-start path in cycle.rs.
• Refactor mark_standing onto a shared mark_standing_in_place.

The ooda_loop breaker driver already exempts perpetual goals (!is_perpetual() filter + classify_standing_idle → benign perpetual_idled); this PR only feeds that predicate correctly.

Tests

New unit + integration coverage proves:

• a standing seed → perpetual goal (cold start) and an ordinary seed stays non-perpetual;
• reconcile_standing_markers self-heals the persisted hygiene goal by id/slug, is idempotent, and ignores unmatched / non-standing / already-perpetual goals;
• end-to-end: a reconciled standing hygiene goal is never re-parked, escalated, or issue-filed over N+1 cycles, while the same goal left unmarked still escalates — proving the tag is exactly the fix.

Validation

• cargo build, targeted + affected-module tests, cargo clippy --lib clean.
• Pre-commit (Rust-only gate, cargo fmt --check, release clippy -D warnings) and pre-push (full lib test suite: 484 passed, all-targets/all-features clippy -D warnings) all green.

Docs

New how-to (docs/howto/declare-a-standing-seed-goal.md) and reference (docs/reference/standing-seed-goal-declaration-api.md), linked in mkdocs.yml nav.

Additive and non-breaking. PRD preserved; no Bridge naming; structured lifecycle logging consistent with the surrounding OODA-start block.

Closes #4927

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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📊 Coverage Summary

Generated by cargo llvm-cov --workspace --summary-only (nightly, excluding test files)

Module	Lines	Covered	Coverage
Total	209127	176313	84.3%

_{Coverage data from CI run. Test files matching tests?/ are excluded from line counts.}