feat: add AI-native development standard and align STYLE_GUIDE

[marcusburghardt]

Summary

• Create AI_NATIVE_DEVELOPMENT.md as the org-wide single source of truth for AI-native development
• Update STYLE_GUIDE.md to align with constitution v1.2.0

AI_NATIVE_DEVELOPMENT.md

New document covering:

• AI-native development philosophy (spec-driven, convention-pack-enforced, council-reviewed)
• 5-step workflow: specify -> spec review -> implement -> code review -> merge
• File classification table (committed vs local-only)
• Convention pack system and hierarchy
• Disclosure standards (Assisted-by trailer requirement)
• Agent-agnostic principle
• Continuous improvement loop
• Quick reference tables for contributors and maintainers

STYLE_GUIDE.md Alignment

Updated to match constitution v1.2.0:

• Normalize to RFC 2119 keywords (MUST/SHOULD/MAY)
• Rename Principle IV: "Code is Written for Humans First" -> "Readability First"
• Replace flake8 with ruff for Python linting
• Add Lint Configuration Awareness section
• Add Assisted-by trailer requirement under commit trailers
• Fix branch model to main-only (remove develop references)
• Add constitution reference as authoritative source
• Add Section 6 linking to AI_NATIVE_DEVELOPMENT.md

Related

• org-infra PR: feat: add standardize-ai-native-development change proposal org-infra#218
• This PR MUST merge before the org-infra PR, which references this document by URL

[sonupreetam]

No blocking findings. Three minor observations below.

This review was generated by /review-pr (AI-assisted).

[sonupreetam]

Inline Observations

STYLE_GUIDE.md, line 160 — [LOW] Missing period (CS-001)
The sentence ending with ...under the project's license is missing a closing period before the parenthetical DCO link.

AI_NATIVE_DEVELOPMENT.md, line 230 — [MEDIUM] Hardcoded command names may become stale (DR-002)
The Quick Reference table hardcodes specific command names (/speckit.specify, /opsx-propose, /opsx-apply, /unleash, /review-council, /review-pr). If any are renamed, this table becomes misleading. Consider noting that per-repo docs/AI.md is the canonical source for current commands.

AI_NATIVE_DEVELOPMENT.md, line 146 — [LOW] External URL may become stale
The link to https://github.com/unbound-force/unbound-force assumes this repo name/org remain stable. Consider referencing a docs page or redirect URL the org controls.

This review was generated by /review-pr (AI-assisted).

[marcusburghardt]

Addressed in a4abdfd:

• STYLE_GUIDE.md line 160 (missing period): Not applicable -- the period is correctly placed after the closing parenthesis on line 162; the parenthetical is part of the sentence.
• AI_NATIVE_DEVELOPMENT.md line 230 (hardcoded commands): Fixed -- added a note pointing to per-repo docs/AI.md as the canonical source for current commands.
• AI_NATIVE_DEVELOPMENT.md line 146 (external URL): Kept as-is -- no plans to change the URL, and if it does change, broader updates would be required anyway.

[gvauter]

LGTM