add operational memory commitments

[pmbstyle]

Summary

• Add a durable operational memory layer for commitments, blockers, follow-ups, decision rules, and related next actions.
• Extract operational items semantically through the model with JSON schema output, avoiding keyword dictionaries.
• Surface active operational memory in Octo routing context and link eligible commitments to runtime plans.
• Resolve linked commitments from structured plan completion/blocker state and document the new memory layer.

Validation

• uv run ruff check src/octopal/tools/plans/management.py tests/test_operational_memory.py
• uv run pytest tests/test_operational_memory.py tests/test_plan_tools.py
• uv run pytest (964 passed, 1 skipped)