ECC 2.0.0 — the agent harness operating system

chore: export marketing campaign command

chore: ship v1.10.0 release surface refresh

chore: prepare v1.9.0 release (affaan-m#666)

- Bump version to 1.9.0 in package.json, package-lock.json, .opencode/package.json
- Add v1.9.0 changelog with 212 commits covering selective install architecture,
  6 new agents, 15+ new skills, session/state infrastructure, observer fixes,
  12 language ecosystems, and community contributions
- Update README with v1.9.0 release notes and complete agents tree (27 agents)
- Add pytorch-build-resolver to AGENTS.md agent table
- Update documentation counts to 27 agents, 109 skills, 57 commands
- Update version references in zh-CN README
- All 1421 tests passing, catalog counts verified

Merge pull request affaan-m#334 from affaan-m/codex/release-1.8.0-core

feat: v1.8.0 harness release (core reliability + parity + new commands)

ECC v1.7.0 — Cross-Platform Expansion & Presentation Builder

ECC v1.6.0 — Codex Edition

ECC v1.5.0 - Universal Edition

fix: preserve content after frontmatter in parse_instinct_file() (aff…

…aan-m#161)

parse_instinct_file() was appending the instinct and resetting state
when frontmatter ended (second ---), before any content lines could be
collected. This caused all content (Action, Evidence, Examples) to be
lost during import.

Fix: only set in_frontmatter=False when frontmatter ends. The existing
logic at the start of next frontmatter (or EOF) correctly appends the
instinct with its collected content.

Fixes affaan-m#148

docs: enhance CONTRIBUTING.md with detailed templates

- Add table of contents
- Add detailed skill contribution template
- Add agent contribution template with field descriptions
- Add hook examples with matcher syntax
- Add command template
- Add PR title format and checklist