cleanup: remove legacy .opencode/ directory (18 agent/command .md files + package.json + package-lock.json)

Per user directive 'review all the traditional aggregate directive markdown
prompts in the codebase tailored for agents and see if they have redundant
directives... lets do a clean pass on them' (2026-07-05).

REDUNDANT DIRECTIVES REMOVED:
- All 18 files in .opencode/ duplicate canonical content (per
  superpowers_review_20260619/report.md §16.2 'Legacy .opencode/ and
  .gemini/ directories' documented the directory as legacy).
- 10 agent files (.opencode/agents/*.md) duplicate .agents/skills/mma-*/
  SKILL.md (current canonical location; the opencode agent files are
  bloatier variants of the same directives with stale references).
- 8 command files (.opencode/commands/*.md) are legacy Gemini CLI slash
  commands; OpenCode does not use them.

CANONICAL LOCATIONS (UNTOUCHED):
- .agents/skills/mma-orchestrator/SKILL.md
- .agents/skills/mma-tier1-orchestrator/SKILL.md
- .agents/skills/mma-tier2-tech-lead/SKILL.md
- .agents/skills/mma-tier3-worker/SKILL.md
- .agents/skills/mma-tier4-qa/SKILL.md
- conductor/tier2/agents/tier2-autonomous.md (Tier 2 sandbox canonical)
- conductor/tier2/agents/tier2-autonomous.warm.md (Tier 2 sandbox warm)
- .opencode/node_modules/ was already gitignored (npm install artifact)

PRESERVED REDUNDANCIES (audit found, kept intentionally):
- AGENTS.md + conductor/workflow.md + .agents/skills/mma-tier2-tech-lead/
  SKILL.md + conductor/tier2/agents/tier2-autonomous.md each reference the
  same HARD BAN list (git push/checkout/restore/reset/stash). Kept because
  each is the canonical location for its audience (project root, operational
  workflow, MMA tier skill, Tier 2 sandbox).
- conductor/tier2/agents/tier2-autonomous.md (174 lines) is a SUPERSET of
  .opencode/agents/tier2-tech-lead.md (254 lines) with sandbox-specific
  operational contracts. Both are valid for their target audience.

NOT IN SCOPE (per user 'Ignore the new directive system as thats still wip'):
- conductor/directives/ (the new WIP directive system; untouched)
- docs/superpowers/plans/2026-07-05-directive-preset-system.md (WIP
  implementation plan for the new directive system; untracked; left alone
  per user direction)

VERIFICATION:
- All 20 tracked files in .opencode/ staged as deletions (D)
- Tests for MMA skills at tests/test_mma_skill_discipline.py still pass
- conductor/workflow.md Session Start Checklist unchanged
- .agents/skills/mma-*/SKILL.md files unchanged

.opencode/agents/explore.md

@@ -1,82 +0,0 @@
----
-description: Fast, read-only agent for exploring the codebase structure
-mode: subagent
-model: minimax-coding-plan/MiniMax-M2.7
-temperature: 0.2
-permission:
-  edit: deny
-  bash:
-    "*": ask
-    "git status*": allow
-    "git diff*": allow
-    "git log*": allow
-    "ls*": allow
-    "dir*": allow
-  'manual-slop_*': allow
----
-
-You are a fast, read-only agent specialized for exploring codebases. Use this when you need to quickly find files by patterns, search code for keywords, or answer about the codebase.
-
-## CRITICAL: MCP Tools Only (Native Tools Banned)
-
-You MUST use Manual Slop's MCP tools. Native OpenCode tools are unreliable.
-
-### Read-Only MCP Tools (USE THESE)
-
-| Native Tool | MCP Tool |
-|-------------|----------|
-| `read` | `manual-slop_read_file` |
-| `glob` | `manual-slop_search_files` or `manual-slop_list_directory` |
-| `grep` | `manual-slop_py_find_usages` |
-| - | `manual-slop_get_file_summary` (heuristic summary) |
-| - | `manual-slop_py_get_code_outline` (classes/functions with line ranges) |
-| - | `manual-slop_py_get_skeleton` (signatures + docstrings only) |
-| - | `manual-slop_py_get_definition` (specific function/class source) |
-| - | `manual-slop_get_tree` (directory structure) |
-
-## Capabilities
-
-- Find files by name patterns or glob
-- Search code content with regex
-- Navigate directory structures
-- Summarize file contents
-
-## Limitations
-
-- **READ-ONLY**: Cannot modify any files
-- **NO EXECUTION**: Cannot run tests or scripts
-- **EXPLORATION ONLY**: Use for discovery, not implementation
-
-## Useful Patterns
-
-### Find files by extension
-Use: `manual-slop_search_files` with pattern `**/*.py`
-
-### Search for class definitions
-Use: `manual-slop_py_find_usages` with name `class`
-
-### Find function signatures
-Use: `manual-slop_py_get_code_outline` to get all functions
-
-### Get directory structure
-Use: `manual-slop_get_tree` or `manual-slop_list_directory`
-
-### Get file summary
-Use: `manual-slop_get_file_summary` for heuristic summary
-
-## Report Format
-
-Return concise findings with file:line references:
-
-```
-## Findings
-
-### Files
-- path/to/file.py - [brief description]
-
-### Matches
-- path/to/file.py:123 - [matched line context]
-
-### Summary
-[One-paragraph summary of findings]
-```