[Bug] Plugin agents and commands incorrectly included in <available_skills> block

Bug Description
Bug: Plugin commands incorrectly listed as skills in <available_skills>

Expected behavior: Only actual skills (defined by SKILL.md files, invokable via /skill-name) should appear in <available_skills>.

Actual behavior: The list includes ALL plugin components - agents, workflow commands, and other non-skill items - inflating the count from the actual skill count to 81 items.

Proof from /context output:

The context output clearly separates these as distinct categories:
Custom agents · /agents
└ compound-engineering:research:framework-docs-researcher
└ compound-engineering:design:figma-design-sync
...

Slash commands · 60 of 81 commands

Yet in <available_skills>, these same agents appear:
compound-engineering:resolve_parallel
compound-engineering:workflows:work
compound-engineering:workflows:plan

Impact:

1. Token waste - 5.6k tokens bloating every request
2. Misleading skill counts (81 "skills" when far fewer are actual skills)
3. Potential for invoking agents incorrectly via Skill tool instead of Task tool
4. Makes the mandatory skill check scan match incorrectly on agent/command keywords

Reproduction:

1. Have plugins with multiple component types (skills, agents, commands)
2. Check <available_skills> in system prompt
3. Note that agents and other non-skill components are listed as skills

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.0.73
• Feedback ID: 786a3871-b893-4775-8bb1-196221cc2e6a

Errors

[{"error":"Error: Plugin hook \"node \"/Users/kyle/.claude/plugins/cache/thedotmack/claude-mem/7.3.3/scripts/user-message-hook.js\"\" failed with exit code 3\nstderr: 📝 Claude-Mem Context Loaded\n   ℹ️  Note: This appears as stderr but is informational only\n\n\n\^[[1m\^[[36m[kylesnowschwartz.github.io] recent context\^[[0m\n\^[[90m────────────────────────────────────────────────────────────\^[[0m\n\n\^[[2mLegend: 🎯 session-request | 🔴 bugfix | 🟣 feature | 🔄 refactor | ✅ change | 🔵 discovery | ⚖️  decision\^[[0m\n\n\^[[1m💡 Column Key\^[[0m\n\^[[2m  Read: Tokens to read this observation (cost to learn it now)\^[[0m\n\^[[2m  Work: Tokens spent on work that produced this record (🔍 research, 🛠️ building, ⚖️  deciding)\^[[0m\n\n\^[[2m💡 Context Index: This semantic index (titles, types, files, tokens) is usually sufficient to understand past work.\^[[0m\n\n\^[[2mWhen you need implementation details, rationale, or debugging context:\^[[0m\n\^[[2m  - Use the mem-search skill to fetch full observations on-demand\^[[0m\n\^[[2m  - Critical types (🔴 bugfix, ⚖️ decision) often need detailed fetching\^[[0m\n\^[[2m  - Trust this index over re-reading code for past decisions and learnings\^[[0m\n\n\^[[1m\^[[36m📊 Context Economics\^[[0m\n\^[[2m  Loading: 10 observations (3,019 tokens to read)\^[[0m\n\^[[2m  Work investment: 10,283 tokens spent on research, building, and decisions\^[[0m\n\^[[32m  Your savings: 7,264 tokens (71% reduction from reuse)\^[[0m\n\n\^[[1m\^[[36mDec 19, 2025\^[[0m\n\n🎯 \^[[33m#S196\^[[0m User inquired about available skills in the Claude Agent SDK system (Dec 19 at 6:57 PM)\n\n🎯 \^[[33m#S195\^[[0m User requested to activate frontend skills but no frontend-specific skills are currently installed (Dec 19 at 6:57 PM)\n\n\^[[2mGeneral\^[[0m\n  \^[[2m#742\^[[0m  \^[[2m6:57 PM\^[[0m  🔵  Skills System Query \^[[2m(~243t)\^[[0m \^[[2m(🔍 1,608t)\^[[0m\n  \^[[2m#743\^[[0m  \^[[2m6:58 PM\^[[0m  🔵  Skills System Query \^[[2m(~200t)\^[[0m \^[[2m(🔍 293t)\^[[0m\n\n🎯 \^[[33m#S199\^[[0m User attempted to activate the frontend-design skill but discovered it is not installed in the environment (Dec 19 at 6:58 PM)\n\n🎯 \^[[33m#S200\^[[0m Locate and read the frontend-design skill definition file to understand its guidelines and capabilities (Dec 19 at 7:22 PM)\n\n\^[[2mGeneral\^[[0m\n  \^[[2m#750\^[[0m  \^[[2m7:23 PM\^[[0m  🔵  Frontend Design Skill File Not Found \^[[2m(~269t)\^[[0m \^[[2m(🔍 1,720t)\^[[0m\n  \^[[2m#751\^[[0m           🔵  Frontend Design Skill File Not Found in Expected Plugin Location \^[[2m(~272t)\^[[0m \^[[2m(🔍 1,703t)\^[[0m\n  \^[[2m#752\^[[0

Note: Error logs were truncated.