docs(jules): curate agent journals, canonicalize .jules casing, remove scratch debris

[seonghobae]

Why

The .Jules agent journals had accumulated systemic quality defects: the repo tracked BOTH .Jules/ and .jules/ as case-duplicate directories with divergent content (colliding on case-insensitive filesystems and causing phantom git add failures), a third fragment lived at backend/.jules/sentinel.md, most entry dates were fabricated (2024/2025 dates predate the repository, whose history starts 2026-02), several entries were duplicated or contradictory, and 13 fix_plan*.txt agent-scratch files were tracked at the repo root.

What

• Canonicalize casing: remove the capitalized .Jules/ directory; .jules/ (lowercase) is now the single canonical journal path, documented in AGENTS.md along with the journal entry format and an evidence-based dating rule.
• Curate journals with evidence-based dates: rewrite bolt.md (14 entries), palette.md (13), and sentinel.md (3) as deduplicated, newest-first journals. Every date is derived from first-appearance evidence in git history (git log -S). Overlapping entries merged (export lookup maps, map.set patterns, abbreviation badges, disabled-control semantics, STRIX scope guidance), Korean entries translated to English, and the hot-path-vs-batch Map guidance contradiction resolved with explicit cross-references between the two entries.
• De-weaponize security guidance: the palette entry that advised avoiding vulnerable files "to dodge STRIX CI" now instructs fixing or reporting findings instead of evading scanners.
• Absorb fragments: fold backend/.jules/sentinel.md (HKDF entry) into the root sentinel journal; restore the share-redaction sentinel entry whose heading on main was a literal unexpanded $(date +%Y-%m-%d).
• Repo hygiene: delete fix_plan3-15.txt scratch files; add .codegraph/ to .gitignore.
• Backend validation hardening (runtime behavior change): review surfaced that the sentinel journal promised C0/C1 control-character blocking while backend/app/schemas.py only rejected C0+DEL. The project_name, member_subject, and conn_name patterns now reject the full C0/C1 ranges (^[^\x00-\x1F\x7F-\x9F]+$), with C1 rejection cases added to backend/tests/test_schema_validation.py. Names containing C1 bytes (U+0080-U+009F) are now rejected with 422; legitimate names are unaffected.

Review notes

• Earlier commits in this PR address the five Copilot review threads on the original journal content (control-char regex C0+C1 + Pydantic v2 APIs, aria-disabled pattern, benchmark normalization); the curation commits supersede the raw journals with the corrected content.
• Full backend suite (379 tests) and mypy pass locally on the final head.

[Copilot]

Pull request overview

Documentation-only update to the repository’s .Jules guidance notes, consolidating recent performance, accessibility, and security learnings for future reviewers/agents.

Changes:

• Replaced .Jules/sentinel.md entry with guidance on hardening Pydantic string validation against control characters.
• Updated .Jules/palette.md accessibility notes (disabled button guidance, table-row input labeling, abbreviation announcements).
• Expanded .Jules/bolt.md with a larger set of performance lessons and action patterns.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
.Jules/sentinel.md	Updates security guidance for validating user-provided strings (control characters).
.Jules/palette.md	Refreshes accessibility guidance for UI patterns and screen reader behavior.
.Jules/bolt.md	Adds/refreshes performance optimization learnings and recommended patterns.

Comments suppressed due to low confidence (1)

.Jules/bolt.md:13

• The guidance here duplicates the later entry “2024-07-01 - Avoid O(N^2) Complexity in Graph Exporters” (both advise precomputing lookup Maps/Sets to avoid nested .find()/.some() loops). Keeping both makes the notes harder to scan and increases the chance future edits diverge. Consider consolidating into a single entry (or cross-referencing one from the other).

## 2026-06-20 - O(N^2) loops for finding items in export
**Learning:** Nested array `.find()` iterations within loops parsing graph connections result in O(N^2) complexity, significantly degrading UI performance for large outputs.
**Action:** Always pre-compute a lookup `Map` in O(N) when multiple specific node lookups are needed within iterative processes.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 21 out of 22 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 23 out of 24 changed files in this pull request and generated 1 comment.