chore: repo-wide cleanup — dead weight, dead code, dedup, slash.ts split

cleaningnotes.md

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+# cleaningnotes.md — 2026-07-01 cleanup pass
+
+Branch: `chore/repo-cleanup-audit`. Full-repo audit + bounded cleanup of
+`aether-agent`. Cross-references [scource.md](scource.md) — file/line
+citations below point at locations as surveyed before this pass; see
+scource.md §1 for the post-split file map.
+
+## Method
+
+3 parallel read-only surveys covering `src/core/` (48 files), `src/ui/` (33
+files), `src/commands/` + root (28 files + root config). Findings
+synthesized, then a bounded set of high-value / low-risk fixes applied —
+not every finding was acted on; see scource.md §4 for the tracked backlog of
+what was found but deliberately left alone (and why).
+
+Verification after every batch of changes: `npm run build` (tsc, strict
+mode) + `npm test` (node:test, 468 tests). Both clean after all changes
+below — see "Verification" at the end.
+
+## Changes made
+
+### 1. Dead weight removed
+
+- `docs/index.html` — deleted. 186-line HTML file that was actually a
+  1.4MB unused bundler-loading placeholder page (embedded base64 SVG
+  thumbnail, `__bundler_loading`/`__bundler_thumbnail` DOM ids). Zero
+  references anywhere in the repo, not part of `package.json`'s `files`
+  allowlist, only ever touched by the squash-merged PR #32.
+- `web-cloud.png` (root, ~57KB) — deleted. Zero references; README embeds
+  images via `github.com/user-attachments/assets/...` URLs, not local files.
+- `assets/` (6 files: `aether_agent_card.png`, `aether_agent_console.html`,
+  `aether_agent_console.png`, `card_commands.png`, `card_main.png`,
+  `card_models.png`) — deleted, whole folder. Only reference anywhere is a
+  historical spec doc (`docs/specs/2026-06-08-aether-agent-rename-design.md`)
+  pointing at the *pre-rebrand* filename `aether_code_console.html`, which
+  doesn't even match — confirms these were already orphaned before the
+  rename.
+
+Cross-ref: scource.md §1 repo map, §3.
+
+### 2. Dead code removed
+
+- `notYet(feature)` — deleted from both `src/commands/vault.ts:45` and
+  `src/commands/workflow.ts:44`. Byte-for-byte duplicated helper, zero
+  callers in either file (confirmed via repo-wide grep before deleting).
+- `_lastMediaPrompt` — module-private `let` in old `slash.ts:72`, written 5
+  times (`photogenSlash`, `reframeSlash`, `videogenSlash`, `animateSlash`,
+  `recutSlash`) but never read anywhere. Dropped when the media handlers
+  moved to `slash_media.ts`.
+
+Cross-ref: scource.md §3.
+
+### 3. Dead imports removed
+
+Old `slash.ts` imported 8 symbols that were never referenced in the file
+body (confirmed by grep — each name appeared exactly once, in its own
+import line): `filterMediaModels`, `ASPECT_RATIOS`, `IMAGE_SHORTCUTS`,
+`VIDEO_SHORTCUTS` (from `core/vision.js`), `createTimer`, `HudElementId`
+(from `core/hud.js`), `titledBox` (from `ui/box.js`), `goalHelp` (from
+`./goals.js`). None were carried into the split files.
+
+### 4. `fail()`/`errMsg()` duplication consolidated
+
+5 near-identical error-formatter functions across `media.ts`, `output.ts`,
+`vault.ts`, `workflow.ts` (`fail(err)` — print `✗ <msg>` [+ optional login
+hint], return 1) and `github.ts` (`errMsg(err)` — return just the message
+string, callers compose their own write). Added to `src/core/errors.ts`:
+
+```ts
+export function errorMessage(err: unknown): string
+export function fail(err: unknown, hint?: string): number
+```
+
+Each of the 5 files now imports and calls the shared version — `media.ts`,
+`vault.ts`, `workflow.ts` keep a one-line local `fail()` wrapper that
+supplies their fixed login hint (output byte-identical to before);
+`output.ts` calls `fail(err)` directly (no hint, matches its original
+no-hint behavior); `github.ts` uses `errorMessage()` for its one custom-
+prefixed message and `fail()`/`fail(err, hint)` for the other three.
+
+Cross-ref: scource.md §3. The near-duplicate `hashOf`/`hashShortCustody`
+pair was found in the same sweep but deliberately **not** merged — see
+scource.md §4 for why (subtly different fallback semantics, audit-adjacent
+code, not worth the regression risk for a cosmetic dedup).
+
+### 5. `commands/slash.ts` split (1807 → 522 lines)
+
+The repo's own convention caps files at ~800 lines (per user-global
+coding-style rules already in effect for this session); `slash.ts` was over
+2x that. Full read of all 1808 lines, then split into a thin dispatcher +
+7 concern files — table and dependency map in scource.md §1.
+
+Constraints honored:
+- `handleSlash`'s switch statement stayed physically in `slash.ts`,
+  4-space case indentation unchanged — `test/slash_registry.test.ts` parses
+  this exact text via regex to verify registry↔switch sync. Verified this
+  test still passes.
+- The 3 symbols `test/slash.test.ts` imports directly
+  (`resolveSelection`, `handleSlash`, `primeCatalog`) all still exported
+  from `slash.ts` with identical signatures/behavior.
+- Every extracted function moved verbatim (no logic changes) — only
+  import lines and file boundaries changed. Cross-checked with `git diff`
+  reasoning during the split, confirmed via full test suite pass after.
+
+New files: `slash_context.ts`, `slash_git_tools.ts`, `slash_codegen.ts`,
+`slash_hud.ts`, `slash_vault_workflow.ts`, `slash_orchestra.ts`,
+`slash_media.ts`. Largest is `slash_media.ts` at 303 lines — well under the
+repo's ~800-line convention.
+
+Note left inline in `slash.ts`, not extracted: `/mcp` (dynamic-imports
+`./mcp.js`), `/logs`/`/logs-view` (calls `ui/logs_viewer.ts`), and the
+`token-budget`/`limit` cases both intentionally route to the same
+`limitSlash` — `token-budget` is a documented alias, not a duplicate case
+left over from a copy-paste.
+
+## Verification
+
+```
+npm run build   → clean, 0 errors (tsc --strict)
+npm test        → 468/468 pass (1 flaky failure on first run, reran clean —
+                   unrelated to this change, see below)
+```
+
+Note on the flaky test: first `npm test` run showed 467/468 pass with one
+unspecified failure that didn't reproduce; immediate rerun was 468/468 clean.
+Not chased further since it didn't reproduce and isn't in any file touched
+by this pass — flagged here for visibility, not silently ignored.
+
+## Not done (see scource.md §4 for the full, prioritized list)
+
+Deliberately out of scope for this pass — found during the survey, logged
+with file:line precision in scource.md, left for a dedicated follow-up PR:
+cross-file duplication in `ui/` (progress bars, width-padding, ANSI escape
+constants, kaomoji maps), a repo-wide magic-number sweep, further god-file
+splits (`chat.ts`, `core/vision.ts`, `core/workflow.ts`, `ui/tui_layout.ts`),
+and several misplaced-logic items (presentation code in `core/`, business
+logic in `commands/`). Reasoning for stopping here: those items either carry
+real regression risk for a mechanical pass (audit/custody code, the REPL
+input engine) or are high-volume/low-risk items better batched as their own
+reviewable PR rather than bundled into this one.