feat(visibility): add TTFV optimization, CONTRIBUTING rewrite, and distribution playbooks

Phase 0 - Foundation work for visibility campaign:

- Add TL;DR Quick Start section in README with CLAUDE.md template
- Rewrite CONTRIBUTING.md with welcome message, contribution types, PR process
- Add CODE_OF_CONDUCT.md (Contributor Covenant v2.1)
- Document French whitepapers series (8 docs, ~185 pages) in README
- Add distribution playbooks in claudedocs/ (gitignored)
- Add prominent badges (version, license, Claude Code support)

TTFV (Time-to-First-Value) optimized from ~10min to < 5min.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CODE_OF_CONDUCT.md

@@ -0,0 +1,60 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior:
+
+* The use of sexualized language or imagery and unwelcome sexual attention
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information without explicit permission
+* Other conduct which could reasonably be considered inappropriate
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+[florian.bruniaux@gmail.com](mailto:florian.bruniaux@gmail.com).
+
+All complaints will be reviewed and investigated promptly and fairly.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.1, available at
+[https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
+
+[homepage]: https://www.contributor-covenant.org
+[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html