docs: consolidate duplicated explanations and trim slop

[max-sixty]

Sweep of the docs for repetition and filler, from an audit of the hand-authored pages, the command pages' source in src/cli/mod.rs, and the plugin skill. Net −574 lines; every cut either had a surviving canonical home or restated an adjacent sentence.

One home per mechanism (other mentions now link to it):

• template-append — the LLM commits guide owns the rendering mechanism; the user- and project-config sections keep the key, an example, and what is unique to them (the project approval gate and the only-template-append-from-project scoping). Was explained in full in three places.
• -vv diagnostic files — wt config state logs owns the four file descriptions; the FAQ summarizes in one sentence and links.
• fsmonitor/trash cleanup — the FAQ's two overlapping wt remove bullets merge into one that distinguishes own-daemon teardown from the orphan sweep; troubleshooting.md's restatement compresses to a pointer, keeping its unique wedged-daemon-on-live-worktree guidance.
• copy-ignored built-in excludes — the wt step copy-ignored page owns the directory list (previously enumerated 4×); the config sections state the rule and link.
• hook-types table — wt hook owns it; the extending guide replaces its verbatim copy with a sentence.
• LLM tool commands — unchanged, deliberately: the apparent hand-synced duplication between llm-commits.md and the config example is already machine-pinned by test_llm_docs_commands_match_config_example, so it cannot drift.

Cut-over debt: the deprecated wt config state ci-status section shrinks to a deprecation pointer — its status table, fetch order, and caching notes all duplicated the wt list CI-status section.

Structure: wt step copy-ignored's "Features" list dissolves into the sections that owned its facts (excludes → "What gets copied", reflink → "Performance"); the four trailing "Note: This command is experimental…" lines go (the [experimental] badge already appears twice per section); shell-integration.md described the directive-file mechanism twice and now describes it once.

SKILL.md drops from 339 to 181 lines: the permission-model section duplicated the config-types bullets, the hook-type mapping appeared twice, and the "Determining Which Config to Use" / "Validation Before Adding Commands" scaffolding enumerated judgments an agent makes on its own. The approvals-escalation and agent-handoff sections are untouched.

Deliberately not addressed: wt list's schema 1 JSON tables (still the default schema; the wholesale deletion lands when the default flips) and corpus-wide em-dash density (a house-style decision, not a per-page fix).

Generated mirrors (docs command pages, skill references, plugins mirror, dev/*.example.toml, help snapshots) regenerated via test_docs_are_in_sync and cargo insta.

This was written by Claude Code on behalf of max