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/wiki-ingest/SKILL.md

@@ -1,13 +1,14 @@
 ---
 name: wiki-ingest
 description: "Ingest sources into the Obsidian wiki vault. Reads a source, extracts entities and concepts, creates or updates wiki pages, cross-references, and logs the operation. Supports files, URLs, and batch mode. Triggers on: ingest, process this source, add this to the wiki, read and file this, batch ingest, ingest all of these, ingest this url."
+allowed-tools: Read Write Edit Glob Grep Bash WebFetch
 ---
 
 # wiki-ingest: Source Ingestion
 
 Read the source. Write the wiki. Cross-reference everything. A single source typically touches 8-15 wiki pages.
 
-**Syntax standard**: Write all Obsidian Markdown using proper Obsidian Flavored Markdown. Wikilinks as `[[Note Name]]`, callouts as `> [!type] Title`, embeds as `![[file]]`, properties as YAML frontmatter. If kepano/obsidian-skills is installed, its `obsidian-markdown` skill is the authoritative syntax reference.
+**Syntax standard**: Write all Obsidian Markdown using proper Obsidian Flavored Markdown. Wikilinks as `[[Note Name]]`, callouts as `> [!type] Title`, embeds as `![[file]]`, properties as YAML frontmatter. If the kepano/obsidian-skills plugin is installed, prefer its canonical obsidian-markdown skill for Obsidian syntax reference. Otherwise, follow the guidance in this skill.
 
 ---