[codex] Split session MCP tool definitions

[ScriptedAlchemy]

Summary

• reviewed the last 100 merged PRs (test: consolidate graph and hooks/lsp tests into two binaries #185 through chore: release v0.0.30 #289) as one aggregate change surface
• split message/session/workflow MCP tool schemas out of the 3.9k-line definitions module
• reused the shared git-scope schema helpers for both workflow and LCM grep definitions

Validation

• tracedecay sync
• cargo fmt --check
• cargo check -q
• cargo test -q --lib mcp::tools::definitions::tests
• cargo test -q --lib tool_definitions_and_dispatch_handlers_stay_in_lockstep
• cargo test -q --lib profile_scoped_lcm_definitions_and_handlers_stay_in_lockstep
• cargo test -q --test mcp_suite message_search_provider_schema_matches_ingested_providers
• cargo test -q --test mcp_suite every_mcp_tool_is_invocable_via_cli_short_name
• cargo test -q --test agent_suite every_mcp_tool_renders_its_own_cli_help
• git diff --check

Notes

• original checkout was dirty and divergent, so this was done in an isolated worktree from origin/master

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Latest commit: 6568f28

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