宜博 / lemongraph

Implements docs/todo/role-package-abstraction-design.md. Requirements
review (docs/todo/graph-engineering-open-items.md's H section) had already
corrected the requirements doc's own dependency analysis before this;
scope confirmed with user 2026-08-06: relax all 4 org_node CHECK
constraints in one pass, not staged.

Format is JSON, not YAML: 05 §5.7's pure-stdlib constraint rules out
PyYAML, and unlike Skill files (whose YAML frontmatter only Claude Code
itself ever parses, never this codebase's own Python), role.json genuinely
needs to be read by agent_profile.py -- json.load is the zero-risk choice
over a hand-rolled parser.

role.json is a REFERENCE manifest, not a content copy: identity.soul_md_path/
agents_md_path still point at the untouched agents/<role>/SOUL.md/AGENTS.md
files. This is what makes "deployed output must stay identical" close to
automatic -- render_agent_definition()'s body-assembly logic doesn't
change at all, only the frontmatter's data source does (hardcoded
FRONTMATTER dict -> parsed role.json). Verified byte-for-byte: diffed the
old (git HEAD) render_agent_definition() output against the new one for
all three roles, zero differences.

agent_profile.py: ORG_NODES is now discovered by scanning roles/ for
role.json files (_discover_role_ids()) instead of a hardcoded 3-tuple;
FRONTMATTER/_DESCRIPTIONS/_MIGRATED_FROM_PROFILE dicts are gone. Every
public function takes an optional roles_dir override specifically so a
test can prove "a new role needs zero code changes" against a throwaway
fixture directory (NewRoleWithoutCodeChangeTest) rather than asserting it
by inspection.

schema.py: skill.owner_org_node/task.assigned_org_node/work_graph_run.org_node/
agent_profile.org_node relaxed from CHECK(x IN ('planner','coder','validator'))
to CHECK(x != ''). Real blast radius found during design (bigger than the
requirements doc's own risk note): task/work_graph_run/skill are
referenced by several other tables' foreign keys, but since only the
parent tables' own CHECK text changes (child FK definitions are untouched),
only these 4 parent tables need rebuilding -- followed SQLite's documented
procedure for schema changes under active foreign keys (foreign_keys=OFF
for the duration, rebuild, foreign_key_check to confirm nothing went
dangling, foreign_keys=ON). migrate_relax_org_node_constraints() depends
on D's migrate_add_work_graph_fork_columns() having run (called
unconditionally, idempotent) so work_graph_run's rebuild has the right
column set either way. ux_work_graph_run_active and task's 3 indexes
verified to survive the rebuild.

work_graph_run_query.py's own separately-hardcoded _VALID_ORG_NODES
(a real dependency the requirements doc's risk section missed) now reuses
agent_profile.ORG_NODES instead of maintaining a second copy.

Explicitly NOT done (scoped out during requirements review, not an
oversight): frontend/app.js's 4 hardcoded 3-role spots (route regex, sort
order, dropdown, lookup object) -- a new role still won't be recognized by
the PH3 console. A `role` table with real FK referential integrity was
also not built; this uses the simpler "just relax the enum" approach.

Full src suite (623 tests) + supervisor suite (125 tests) pass with zero
regressions.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Implements docs/todo/work-graph-time-travel-debugging-design.md, backend
and console together (user confirmed 2026-08-06).

Key finding that shrank the v1 scope: ux_work_graph_run_active is a
PARTIAL unique index (only covers non-terminal statuses), not a blanket
one -- forking from a parent run that's already reached a terminal status
never collides with it at all. v1 restricts forking to exactly that case,
so no index/constraint change is needed, only two new nullable columns
(parent_run_id, fork_of_node_exec_id).

Resolved the requirements doc's FR-1 ambiguity ("override input_payload,
re-trigger execution") as OUTPUT SUBSTITUTION instead: the fork point's
own output_payload is replaced with the human-supplied content directly,
it is never re-executed via a new claude -p call -- only the strict
downstream subgraph actually re-runs. This sidesteps reconciling the
different build_prompt/input_payload conventions each caller uses
(Planner's artifact_type lookup, E's generic task_prompt field, F's jury)
-- work_graph_fork.py only needs the persisted graph_manifest and each
node's output_payload.

Implementation needs ZERO changes to the execution engine: pre-seeding
every non-downstream node as a 'done' work_node_execution row before
calling the unmodified run_graph() on the unmodified graph_manifest is
enough -- run_work_node()'s existing REQ-06 breakpoint-recovery
short-circuit (already-'done' nodes return their persisted output without
calling run_fn) does all the "reuse without re-executing" work for free.
_reconstruct_build_prompt supports two graph shapes generically from
persisted state alone (Planner's canonical doc chain via
e2e_pipeline._planner_prompt_builder, and E's generic task_prompt field);
anything else raises ForkGraphShapeUnsupportedError rather than producing
broken prompts.

New: src/work_graph_fork.py (create_fork/execute_fork/fork_work_graph_run/
start_fork_in_background, the last splitting fast DB-only setup from slow
real execution so an HTTP caller gets run_id back immediately, same
pattern task_execution.start_task_execution_in_background already uses).
work_graph_run gets parent_run_id/fork_of_node_exec_id (SCHEMA_SQL +
migrate_add_work_graph_fork_columns for existing databases).
work_graph_run_query.py/task_query.py surface both fields. New endpoint
POST /api/work-nodes/:node_exec_id/fork. Console: a "从这里分叉" form on
each 'done' node in v_run_detail, a fork badge linking back to the parent
run, and a 🔀 marker on v_graph_console's run list -- no diff/merge UI
(non-goal #3), read-only branch visibility only.

Verified end-to-end for real: started the actual backend, sent a real
HTTP fork request, confirmed the new run persisted with correct
parent_run_id/fork_of_node_exec_id lineage.

Tests cover requirements doc acceptance standards 1-3 (PRD swapped ->
SDD/Benchmark genuinely re-execute, BRD untouched; original run completely
unaffected; the same node forked twice produces independent branches) plus
schema migration idempotency, query-layer field surfacing, the HTTP route,
and 3 frontend smoke-test assertions. Full src suite (608 tests) + all 3
frontend smoke tests pass.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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