doc-audit: fix stale OpenSpec counts, dossier headers, Haven forge gate

[stphung]

Summary

Full 6-agent /doc-audit pass (root/architecture, core engine, content systems, progression systems, infrastructure, README) cross-referenced every CLAUDE.md, README.md, and docs/dossiers/*.md claim against current source. The codebase docs were largely clean; this fixes the handful of real discrepancies found:

• CLAUDE.md / openspec/README.md: the OpenSpec baseline count had drifted (215→216 requirements, 517→525 scenarios). The capability index table in openspec/README.md was also missing a row for the challenges capability entirely and undercounted vessel-act2 by one requirement (19→20) — these two errors happened to offset and mask the drift in the summary line.
• docs/dossiers/act2-pilgrimage.md: "Last refreshed" header was dated 2026-07-05, but the dossier's own Refresh History log (and a same-day docs: correct the "Act 1 idles beneath Act 2" premise; record the launch runway #757 correction to the Act 1/Act 2 interrelations diagram) show substantive edits through 2026-07-15. Bumped to the latest commit that touched the file.
• docs/dossiers/act1-ascent.md: "Last refreshed" header was similarly one commit behind (doc-audit: fix stale docs, add missing mercenary promotion section #706's stale-constant fix on 2026-07-08).
• src/haven/CLAUDE.md: the Storm Forge section described Stormbreaker forging as gated only on the Storm Leviathan achievement, omitting the Prestige Rank 25+ requirement that can_forge_stormbreaker() actually enforces alongside it.

Two additional findings were flagged but intentionally not auto-fixed (left for human judgment):

• README.md claims an MIT license (badge + text) but no LICENSE file exists in the repo — adding one is a legal/business decision, not a doc correction.
• src/challenges/CLAUDE.md deviates from the standard module-doc template (tutorial-style instead of Files/Key Types/How It Works sections) — content is accurate, just structurally different; a LOW-severity, cosmetic-only note.

Everything else audited — root CLAUDE.md's Key Constants, all module CLAUDE.md files under core/combat/character/zones, dungeon/fishing/items/challenges, haven/enhancement/ascension/stormglass/deep/power_cores/god_items/loom/vessel, ui/input/utils/main_helpers/achievements/history, and README.md's player-facing claims — checked out accurate against source.

Test plan

• cargo fmt --check passes
• No src/ files changed — docs-only diff, no risk to tests/clippy/coverage
• cargo audit step of make check could not run in this environment (pre-existing toolchain mismatch: rustc 1.94.1 vs. a cargo-audit transitive dependency requiring 1.96.0), unrelated to this change

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Generated by Claude Code