fix: respect conversation language across all harnesses

[masamaru0513]

Adds a conversation-language rule to core/memory/org.md so all harnesses instruct agents to write human-readable artifacts in the user's language. Rebased onto the current v2 architecture (the pre-v2 persona-prompt-augment.yaml and conventions/ are gone).

Fixes #288

Summary

Adds a Conversation language rule to the ## Mandated section of core/memory/org.md. The rule states a principle: anything a person reads or reviews follows the conversation language; only machine-parsed/verified content stays English (stable IDs, enum values, code, file paths, mermaid keywords, template section headings, state files). One byte-shared source propagates to all four harnesses (claude, codex, kiro, kiro-ide) via bun scripts/package.ts.

This is feedforward prose — it does not guarantee 100% enforcement (no sensor checks output language). But in practice the presence or absence of the rule makes a large, consistent difference.

Changes

• core/memory/org.md: added conversation-language rule to ## Mandated
• core/tools/aidlc-version.ts: version bump 2.1.1 → 2.1.2
• README.md: version badge updated
• CHANGELOG.md: added ## [2.1.2] entry
• dist/ (4 harnesses): regenerated via bun scripts/package.ts

User experience

Before (no rule):

Harness	Behaviour
Claude Code	Artifacts and chat dialogue fully English from the first stage, even when the user types in Japanese
kiro-cli	Bodies mostly Japanese, but English leaks into secondary prose, sub-agent (reviewer) output, and design-spec files (interaction-spec, design-system-mapping, accessibility-checklist)

After (with this change):

Harness	Behaviour
Claude Code	Same artifacts and dialogue fully in the user's language; IDs / code / paths stay English
kiro-cli	Previously leaking files now render in the user's language; machine tokens stay English

Verification

Ran the same Japanese prompt (簡単なTODOアプリを作りたい) on clean v2 (no rule) vs this change, on both kiro-cli and Claude Code. The control isolates the rule as the only variable — the before/after table above summarises the results.

Checklist

• I have reviewed the contributing guidelines
• Edited hand-authored source in core/, not dist/
• Ran bun scripts/package.ts and committed regenerated dist/
• bun scripts/package.ts --check reports no drift
• Version bumped (core/tools/aidlc-version.ts + README badge + CHANGELOG entry)

[masamaru0513]

@raj-jain-aws This is the v2 rebuild of #290 (now closed), reshaped onto the current v2 structure as you suggested. Source-only, no dist/ changes. I've posted the full before/after test results on #288. Would appreciate a review when you have a chance — thanks! 🙏

[wowzoo]

Same on the v2 branch with Korean intents. Across 4 independent dry-run fixtures (different intent shapes — greenfield SaaS, a feature add on an existing service, a consumer-app MVP, a local-only full-stack service) the persona-authored artifacts under each intent's stages/ directory came out in English even though the human's prompts and pre-supplied PRDs were entirely in Korean. Korean only survived in verbatim quotes of human input.

Glad to see this PR — happy to test it against the four Korean fixtures once it merges.

[masamaru0513]

Update (2026-06-27): Rebased and reworked for the v2-unified architecture (introduced 2026-06-15 in 7b824b3; core/memory/ finalized in 2.1.0, e713c4f 2026-06-24). See updated PR description for details.

• Base changed v2_backup → v2. The diff is now just the single source
  change to core/memory/org.md plus its regenerated dist/ — 16 files,
  +21/-24.
• Reworked for the current v2 architecture. The rule lives in the shared
  core/memory/ method tree; the pre-v2 persona-prompt-augment.yaml and
  conventions/ are gone, so one byte-shared source now covers all four
  harnesses (claude, codex, kiro, kiro-ide) via bun scripts/package.ts.
• Verified on both kiro-cli and Claude Code against a clean-v2 control —
  before/after table is in the description.
• Version bumped 2.1.1 → 2.1.2 with matching README badge + CHANGELOG entry;
  bun scripts/package.ts --check and t68-version-changelog-sync pass.

[masamaru0513]

Update (2026-07-01): Rebased onto the latest v2 (now at 2.1.4) to pick up #443–#448 and #465. The change itself is unchanged — the conversation-language rule in core/memory/org.md plus its regenerated dist/. Re-bumped the version 2.1.4 → 2.1.5 (following the same convention as the recent releases: aidlc-version.ts across all harnesses + README badge + a numbered ## [2.1.5] CHANGELOG heading), since the earlier 2.1.2 bump was superseded by the releases that landed in the meantime. t68-version-changelog-sync passes. Happy to re-bump again if it collides with another release before merge.