feat(systemcontext): adopt incremental context and git-tree snapshots from opencode - #231
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… from opencode Add two genuinely-missing capabilities adopted from opencode's design: - internal/systemcontext: composable, incrementally-rendered model context runtime (Source/Codec/Reconciler/Epoch) that preserves a cache-stable baseline and emits only changed context as an update. Includes the ctxmgr.IncrementalContext host integration and an opt-in engine wiring (HAWK_INCREMENTAL_CONTEXT=1) so unchanged memories do not rewrite the system prompt each turn. - internal/gitsnapshot: git-object-store file-tree snapshots sharing the source repo object db via objects/info/alternates, with content-addressed Capture, Diff, throwaway-index Preview, Restore, and compare-and-swap WriteIfUnchanged to prevent concurrent clobbering. 8 of the 10 originally proposed opencode adoptions already exist in eyrie/ hawk (prompt caching, tool-output spill, least-privilege permissions, usage ledger, reasoning variants, error taxonomy, OAuth refresh, redaction); these two were the confirmed gaps. All new packages build, lint clean, and pass their tests (systemcontext 12, gitsnapshot 7, ctxmgr + engine suites green).
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Summary
Adopts the two genuinely-missing capabilities identified from a deep-dive of the opencode codebase, implemented idiomatically for hawk.
Changes
#3 — Incremental System-Context (
internal/systemcontext/+ctxmgr.IncrementalContext+ engine wiring)A composable, incrementally-rendered model-context runtime:
Source[V]/Codec/SystemContext/Reconciler/Epoch(opencode's Context Source / epoch / reconcile pattern)ctxmgr.IncrementalContexthost integration; opt-in engine wiring (HAWK_INCREMENTAL_CONTEXT=1) so unchanged memories don't rewrite the## Relevant Memoriessection#5 — Git-object-store file snapshots (
internal/gitsnapshot/)objects/info/alternates(no re-hash of large repos)Capture(tree IDs),Diff, throwaway-indexPreview(dry-run without touching worktree),RestoreWriteIfUnchanged— compare-and-swap to prevent concurrent clobberingScope note
8 of the 10 originally proposed opencode adoptions already exist in eyrie/hawk (prompt caching, tool-output spill, least-privilege permissions, usage ledger, reasoning variants, error taxonomy, OAuth refresh, redaction). This PR implements only the two confirmed gaps, avoiding duplication.
Testing
internal/systemcontext(12 tests),internal/gitsnapshot(7 tests)internal/engine+ctxmgrsuites greengo testsuite,go vetgolangci-lint0 issues,gofmtclean