chore: apply Anthropic best practices to all skills (v1.4.2)

- Add `allowed-tools` frontmatter to all 10 SKILL.md files for tool pre-approval
- Soften kepano/obsidian-skills dependency in 4 skills (canvas, obsidian-bases, obsidian-markdown, wiki-ingest) — now recommends if installed, doesn't require
- Soften banana-claude dependency in canvas skill
- Improve trigger descriptions for defuddle (+4 phrases) and obsidian-markdown (+5 phrases)
- Remove docs/superpowers/plans/ (contained private paths)
- Gitignore claude-obsidian-archive/ and _attachments/
- Bump version to 1.4.2

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

skills/obsidian-bases/SKILL.md

@@ -1,13 +1,14 @@
 ---
 name: obsidian-bases
 description: "Create and edit Obsidian Bases (.base files): Obsidian's native database layer for dynamic tables, card views, list views, filters, formulas, and summaries over vault notes. Triggers on: create a base, add a base file, obsidian bases, base view, filter notes, formula, database view, dynamic table, task tracker base, reading list base."
+allowed-tools: Read Write
 ---
 
 # obsidian-bases: Obsidian's Database Layer
 
 Obsidian Bases (launched 2025) turns vault notes into queryable, dynamic views. Tables, cards, lists, maps. Defined in `.base` files. No plugin required; it is a core Obsidian feature.
 
-**Authoritative reference**: `kepano/obsidian-skills` publishes the canonical `obsidian-bases` skill with full syntax and function reference. Use this skill alongside that one. Official docs: https://help.obsidian.md/bases/syntax
+**Authoritative reference**: If the kepano/obsidian-skills plugin is installed, prefer its canonical obsidian-bases skill. Otherwise, use the reference below. Official docs: https://help.obsidian.md/bases/syntax
 
 ---