feat(goals): add review-gated first-class goals

[dale053]

Closes #427

What changed

added first-class, review-gated goals across the stack. this introduces a new Goal artifact and GoalStatus enum in the model layer, persists approved goals under .vouch/goals/, extends proposal handling with propose_goal, and wires goal support into approval/lifecycle/audit paths. the public surfaces now include kb.propose_goal, kb.list_goals, and kb.goal_set_status on mcp/jsonl/capabilities, plus matching cli commands (vouch propose-goal, vouch list-goals, vouch goal-status) and a vouch digest alias. recall now includes open goals, and bundle/sync/health checks were updated to understand goal artifacts. tests were added/updated in tests/test_goals.py, tests/test_recall.py, and tests/test_storage.py.

Why

this implements #427 so vouch can represent in-flight intent as reviewed, queryable knowledge instead of burying objectives in freeform session text. goals now follow the same review gate and audit guarantees as other writes, enabling agents and operators to recover active objectives (open goals) at session start while keeping status transitions explicit and traceable.

What might break

this is a surface expansion and introduces a new on-disk artifact directory (.vouch/goals/) plus new kb.* methods (kb.propose_goal, kb.list_goals, kb.goal_set_status). existing claim/page/entity/relation flows are unchanged. tooling that assumes only four proposal kinds may need updates to handle goal.

VEP

surface change. if a vep is required for this scope, please link it here before merge.

Tests

• make check passes locally (lint + mypy + pytest)
• New / changed behaviour has a test
• CHANGELOG.md updated under ## [Unreleased]

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📥 Commits

Reviewing files that changed from the base of the PR and between 5c98a3a and 2435cf4.

📒 Files selected for processing (16)

• CHANGELOG.md
• src/vouch/bundle.py
• src/vouch/capabilities.py
• src/vouch/cli.py
• src/vouch/health.py
• src/vouch/jsonl_server.py
• src/vouch/lifecycle.py
• src/vouch/models.py
• src/vouch/proposals.py
• src/vouch/recall.py
• src/vouch/server.py
• src/vouch/storage.py
• src/vouch/sync.py
• tests/test_goals.py
• tests/test_recall.py
• tests/test_storage.py

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