feat(tri): PHI LOOP CLI + MCP server + FPGA CI workflow

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Summary

Three layers of TRI PHI LOOP tooling:

1. t27c subcommands — tri-status, tri-skill-begin/end, tri-cell-checkpoint/seal, tri-gen, tri-test, tri-verdict, tri-experience-save
2. Standalone tri binary (cli/tri/) — full PHI LOOP workflow with status, skill/cell management, gen/test/verdict
3. MCP server (cli/tri-mcp/) — 10 tools via JSON-RPC 2.0 over stdio for AI agent integration (Claude, Cursor, etc.)

Plus FPGA CI workflow (.github/workflows/fpga-build.yml):

• fpga-smoke: Verilog generation only (fast gate on every PR touching specs/fpga or compiler)
• fpga-synthesis: Yosys synthesis with JSON netlist output
• fpga-report: Pipeline status summary

Test

# t27c subcommands
t27c tri-status
t27c tri-skill-begin --issue 367 --desc "test"

# Standalone tri
tri status
tri skill begin --issue 367 --desc "test"

# MCP server
echo '{"jsonrpc":"2.0","id":1,"method":"initialize",...}' | tri-mcp

Closes #367