feat(flows): the flow engine, its fake kit, and scale tests - #78
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…ke kit Implements `define_flow`, `load_flow`, `new_outworlder` and `run_flow` for the new flow API, with the pieces they stand on: - engine: `FlowImpl` (awaited directly: no task, two frames a level, no filesystem work per call), `Call` as the `FlowContext`, the run and its running tree, budgets rolled up eagerly under one lock with per-call deadlines, refcounted cleanup through a shielded reaper, `full_view` for chat. - declaring: roles resolved lazily from the collections' annotations, one interned `Grant` per kind, and `describe()`'s `Declaration`. - viewing: `AgentView`, `SessionView`, `EnvView`, `OutworlderView`, gating every capability a role did not declare; hooks bound per flow call. - journaling: the resume journal (append-only JSONL, batched, compacted on resume) and `FlowState`. - loading: every ref form, the bare-ref rule, flow directories imported under their own name with their siblings importable, modules pinned per run with `FlowLoadConflict`, and `git+` refs pinned to a commit. - fakes: in-memory drivers and `run_fake`, held to the driver contract. Also fixes a race in `HookBridge._waited` that dropped a hook's answer when it arrived between the bridge's two checks, and rewrites specs/runtime/flowing.md for the new engine, marking the old API's modules as legacy. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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feat(flows): the flow engine, its fake kit, and scale tests
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Unit 2 of the new flow API (specs/flows.md): the runtime engine behind
hmz.flows.engine.py(define_flow / load_flow / new_outworlder / run_flow, call node = ctx),declaring.py(role/env requirements, Declaration),viewing.py(Agent/Session/Env/Outworlder views with capability gating),journaling.py(append-only resume journal, FlowState),loading.py(refs, module cache, git+url fetches),fakes.py(public in-memory fake kit).tests/integration/flows/test_engine_flowverse.py(end-to-end over a real on-disk flowverse incl. agit+file://ref, budget exhaustion, journal resume).spi.HookBridge._waitedthat could drop a hook's answer.Perf (flow layer only, fakes): 1.91 µs per sequential subflow call, 6.21 µs journaled; 16,402-node depth-10 tree in 0.042 s CPU; 29,524-node gathered tree 1.6× raw asyncio; 0.1 KiB retained after 100k calls; 0 Tasks and 2 frames per level; FlowDepthExceeded at 64.
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