chore(plugin): deslop merged plugin cleanup

[ScriptedAlchemy]

Goal

Simplify and deslop the plugin work already merged to master, without redoing active PR work or changing plugin behavior.

Scope

• Clean up stale/excessive comments in the unified plugin bundle registry, hooks, and skill frontmatter parser.
• Tighten generated plugin prompts, command wrappers, host READMEs, and Claude source-agent copies while preserving host-specific format overlays.
• Keep the architecture as one shared plugin/ source tree plus per-host overlays for contracts that differ: manifests, hooks, READMEs, Claude/Cursor agent files, Claude commands, Cursor commands/rules.
• Trim stale test commentary and validation docs after the plugin consolidation landed.

Out of scope

• No installer behavior changes.
• No broad refactors.
• No duplication of the prior open cleanup branch; current open PR set was checked before publishing and only release PR chore: release v0.0.25 #245 remained open.

Verification

• git diff --check origin/master..HEAD
• cargo fmt --all --check
• cargo test --test agent_suite claude_plugin_bundle_test -- --nocapture
• cargo test --test agent_suite plugin_skill_contract_test -- --nocapture
• cargo test --test agent_suite shared_skill_contract_test -- --nocapture
• cargo test --test agent_suite update_plugin_test -- --nocapture
• cargo check
• workflow YAML parse via PyYAML
• scripts/check-conventional-commits.sh origin/master..HEAD

TraceDecay-assisted review trimmed roughly 360k tokens across the swarm/simplify scans.

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Latest commit: e0e849f

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