Cleanup: stray autosave artifact, dead code, placeholder header

[yottanami]

Summary

Three independent, trivial cleanups bundled as one PR (each an unrelated one-off, per the issue):

• plugins/devel/#core.el# deleted — a stale Emacs autosave snapshot, predating the current core.el's Ruby LSP block, with a syntax typo ((setq js-indent-level 2)s, a stray trailing s). On why it slipped past .gitignore's #*# rule despite that rule already existing: I checked — the rule (815c818, 2025-09-18) predates the file's own commit (89a4842, 2026-06-26) by about nine months, so it's not a case of the rule missing it in time. An exact-path git add on an already-named file still adds it even if it matches a gitignore pattern; only wildcard/directory adds silently respect .gitignore. Checked the rest of the tree (git ls-files | grep -E '(^|/)(#.*#|.*~|\.#.*)$') — no other stray autosave/backup files are tracked.
• plugins/wm/core.el's header had unfilled template boilerplate (Your Name <your.email@example.com>, a placeholder URL) — filled in with yottanami <yottanami@gnu.org> (the identity every commit to this repo since 2025-09-18 actually uses — checked git log --format='%an <%ae>') and https://github.com/yottanami/noteditor (matches README.org and nix/package.nix's meta.homepage).
• noteditor-user.el: removed ~50 lines of dead, fully-commented-out code referencing use-flags/when-wm/noteditor/flags — grepped the whole tree, none of those exist anywhere in the current codebase. Left the one remaining commented block (loading an optional ~/.noteditor-user.el) alone since it doesn't reference those removed macros and reads as an intentional usage example rather than dead code from a removed feature.

Closes Men-in-Black-5/ideas#22

Test plan

• Diffed the stray autosave file against current core.el to confirm it's genuinely stale, not something worth preserving
• Grepped for use-flags/when-wm/noteditor/flags across the whole tree — confirmed dead before removing
• Grepped for other stray #*#/*~/.#* tracked files — none found
• Parenthesis-balance checks on both edited .el files — balanced
• nix flake check / a live build — no nix/emacs binary in my environment, needs a real check

[yottanami]

Reviewed, and re-derived each factual claim independently rather than taking the PR's word for it:

• Stray autosave file: confirmed the .gitignore #*# rule (commit 815c818, 2025-09-18) predates the stray file's own commit (89a4842, 2026-06-26) by ~9 months — not a case of the rule missing it in time. Also empirically verified the git mechanics claim in a scratch repo: git add on an exact, explicitly-named path does silently stage a file even when it matches .gitignore (no -f needed) — that's genuinely how it slipped through. Confirmed the file itself has the claimed typo ((setq js-indent-level 2)s, line 54) and is a stale duplicate. Also ran the same tracked-stray-file grep across the tree myself — none left.
• Header fill-in: checked full git log history myself — every real commit (excluding the agent's own mib-bot commits) from 2024-04-28 onward uses yottanami <yottanami@gnu.org>, an even longer consistent stretch than the PR claimed. URL matches both README.org's clone URL and nix/package.nix's meta.homepage exactly.
• Dead code removal: grepped the whole tree for use-flags/when-wm/noteditor/flags myself — zero matches, confirming it's genuinely dead. Agree the remaining commented-out ~/.noteditor-user.el load block is a legitimate usage example, not part of the same dead feature, and correctly left alone.

All three edited files balance. Bundling these three as one PR matches ideas#22's own explicit scoping ("bundled as one task since each item is trivial and independent"), so no unrelated-changes concern despite them being unrelated to each other.

Same caveat as the rest of the batch: no agent can run nix flake check or load this, so it needs your confirmation before merge — everything staticly checkable is solid.

[yottanami]

@yottanami This one's waiting on you too — no agent can run nix flake check or load the config, so per policy it holds for your confirmation before merge (see the review comment above for what was statically verified: autosave artifact removal, dead code removal, header fill-in). Steps:

1. Run nix flake check (or just load this branch's config in Emacs) and confirm nothing broke.
2. Merge if it looks good.