feat(project-bootstrap): generic Step 5.6 skill-deps check

Collapse Step 5.6 from a single-skill detector (only the
superpowers@claude-plugins-official plugin) into a generic
`trigger -> fulfiller` table walker that scales to every canonical
CLAUDE.md trigger.

Inline 9-row map in SKILL.md covers: caveman, superpowers (kind: plugin),
using-wiki, using-tasks, using-projects-meta, pulling-before-work,
project-discipline, using-interns, active-platform. The `kind` flag
(skill | plugin) drives which install command is emitted in the chat-only
recommendation block. Detection paths: ~/.claude/skills/<name>/SKILL.md
for skills, plugins.<id> in ~/.claude/plugins/installed_plugins.json
for plugins.

Algorithm: read project's CLAUDE.md -> match each non-comment line vs
map (substring + tolower, mirrors Step 5 idempotent merge) -> for each
canonical match check disk -> print one chat block listing every missing
fulfiller with copy-pasteable install commands, OR a single
"all dependencies satisfied" line. User-custom lines and removed
canonical lines are silently skipped. Hard rule "never auto-install"
preserved verbatim.

version: 1.6.0 -> 1.7.0 (MINOR per project-discipline Rule 3 -- adds
capability, absorbs prior superpowers-only detector cleanly).

Closes [bootstrap-skill-deps-check] (.tasks/STATUS.md done).
Closes [bootstrap-recommend-projects-meta] by absorption -- the deferred
mirror task was the seed of this generalization; the generic walker now
handles using-projects-meta along with everything else, no per-skill
mirror needed.

Design rationale at .wiki/concepts/bootstrap-skill-deps-check.md:
- why generic over per-skill mirrors (5x mirror explosion)
- skill vs plugin kind distinction
- MCP-server-backed skills (only check using-X policy skill;
  setup-X self-fires via Prerequisites pointer)
- source-of-truth invariant: SKILL map + assets/CLAUDE.md.template
  must stay in sync (a future CI lint could enforce)

.wiki/index.md

@@ -15,6 +15,7 @@ Catalog of all wiki pages. One line per page, organized by type. Updated on ever
 
 - [active-platform-decision.md](concepts/active-platform-decision.md) — why `active-platform` is a skill (not a memory entry); why default = Windows; how it's wired into `project-bootstrap`
 - [bootstrap-claude-md-merge.md](concepts/bootstrap-claude-md-merge.md) — project-bootstrap@1.3.0 — Step 5 upgrade path becomes idempotent merge (read → diff vs template → confirm → append missing); fixes silent gap where pre-1.2.0 projects never picked up new canonical triggers (`check across all projects`, `we're on Windows`)
+- [bootstrap-skill-deps-check.md](concepts/bootstrap-skill-deps-check.md) — project-bootstrap@1.7.0 — Step 5.6 collapses the per-skill "detect-and-recommend" mirror shape into one generic `trigger → fulfiller` table walker (skill vs plugin kind, never auto-install); subsumes the deferred `[bootstrap-recommend-projects-meta]` and the existing `superpowers`-only detector
 - [bootstrap-manifest.md](concepts/bootstrap-manifest.md) — record of which `project-bootstrap` / `setup-wiki` / `setup-tasks` versions initialized this project's `.wiki/` and `.tasks/` layout (overwritten on re-bootstrap; history in git)
 - [build-notes.md](concepts/build-notes.md) — why `build.ps1` exists alongside `build.sh`; PS 5.1 backslash-in-zip gotcha; how to extract a `.skill`
 - [install-portability.md](concepts/install-portability.md) — `install.sh` / `build.sh` rewritten to drop `mapfile` (bash 4+) and `find -printf` (GNU only) so stock macOS (bash 3.2 + BSD find) works