docs(api): document public API + JSR publish workflow (score -> 100)

[vladjerca]

Follow-up to #861 (static types, merged). Closes out the remaining JSR score checks to reach 100.

Changes

• Module doc + @example on the mod.ts entrypoint, plus a package README - covers readme/module-doc, examples, and module-docs-in-all-entrypoints.
• JSDoc on every exported symbol (schemas, inferred model types, contracts, factories, client helpers): 100% coverage (414/414), up from 0%. Baseline docs are name-derived one-liners; the entrypoint symbols (traktApi, traktApiFactory, TraktApi, AbortError, Environment, ...) are hand-written. Comments are carried into the generated declarations, so JSR counts them.
• JSR publish workflow (.github/workflows/publish.yml) that publishes via GitHub OIDC, which records provenance (public transparency log entry) on the next release. Runs deno task build:types before publishing.

JSR checklist

check	before	after
No slow types	✅	✅
Description / runtimes	✅	✅
Readme / module doc	❌	✅
Examples	❌	✅
Module docs in all entrypoints	❌	✅
Docs for most symbols	❌ 0%	✅ 100%
Provenance	❌	✅ on next CI publish

Verified

• deno doc symbol coverage: 100% (414/414)
• Module doc + @example detected on the entrypoint
• deno lint, deno check src, deno task openapi:validate, deno task publish:check all clean

Notes

• Symbol docs are a generated baseline; can be enriched over time.
• Ships as 0.5.1 (0.5.0 was already published from feat(api): static types + full docs -> JSR score to 100 #861 with static types only; published versions are immutable). Provenance turns green once 0.5.1 is published through the new workflow (GitHub release or manual dispatch).

[vladjerca]

Added agent rules (trakt-web style) to keep the score from regressing:

• CLAUDE.md (root) routes to .agents/rules/; AGENTS.md loads the core project.md.
• .agents/rules/jsr.md - the 100-score playbook (static types, per-symbol JSDoc, provenance publishing, pre-publish checklist).
• .agents/rules/schemas.md - contract schema conventions (migrated from the old AGENTS.md, plus a JSR note).
• projects/api/CLAUDE.md - loads jsr.md + schemas.md when working in the package.

Not published (outside publish.include).