feat(search): P3.1 filters and multi-query merge

Native include/exclude domains, time_range, topic, exact_match, min_score,
and up to 4 queries fused with RRF. Honesty notes stay off the Warn/fail
path. Tavily keeps include_answer false and sets auto_parameters false.
Cache key is canonical JSON. CLI flags and skill recipe included.

docs/implementer-log.md

@@ -26,6 +26,7 @@ One row per task session that ends in a commit. Newest last.
 | p6/07-api-endpoints | 2026-09-26 | done | 1 | gate: ok | none | The four /v1/batch handlers in new `internal/api/batch.go`: `batchSubmit` (POST) decodes `{"targets":[{url,mode,question,pages,grep,jq,context,recover}]}` flat like `/v1/fetch`, 400 "invalid batch" on bad json/empty list/empty url/bad mode (only empty,clean,raw,digest), then `PreCheck` per target → 422 "blocked: target <idx>: <reason>" with no job, then `Submit` mapping ErrTooManyTargets→422 "too many targets (max 32)", ErrCallerBusy→429+Retry-After 30, ErrBusy→429+Retry-After 60, ErrNoTargets→400, and 202 {success,job_id,status,targets,reused} (status "queued" new, current status reused). `batchStatus` (GET) and `batchResult` (GET {id}/{idx}) and `batchCancel` (DELETE) share `ownership` (unknown or not `c.Name` → 404, never 403; nil batch → 503); status is a summary with no results unless `?results=1` inlines the envelope (Meta+content) on done targets, idx validated 0..targets_total-1 else 404, cancel of a terminal job → 409 "job already finished" else 200 {success,status:cancelled}. `api.go` scoped to the rule-2 changes: `batchMaxBody` (256 KiB) const, the four routes in `New`, and `ServeHTTP` applying the per-path cap once (`/v1/batch`→256 KiB, `/v1/extract`→pdfMaxUpload, else 64 KiB) and collapsing every batch path to a fixed metrics label via `batchObservePath` (`/v1/batch` or `/v1/batch/{id}`, never a job id). Each handler logs one `batch` line with caller/job_id/targets/status-or-reused and never a URL/hostname/idem_key. Given test byte-identical; all api tests pass under -race -count=3; make gate ok. |
 | p6/08-serve-config | 2026-09-26 | done | 1 | gate: ok | none | `[batch]` config in `internal/config`: the `Batch` type (disabled/targets_per_job/jobs_per_caller/jobs_total/workers/ttl/max_bytes) and `File.Batch`, plus `ParseSize` (trims spaces, accepts only binary KiB/MiB/GiB suffixes or a plain byte count, zero/negative/other → def). serve.go opens the dcache store when batch is on (`!cfg.Batch.Disabled`) alongside dixie/search — same path, same call, Warn on failure — then, before building the runner, reaps in-flight jobs a restart killed via `MarkInFlightFailed("restart", now)` with one `ObserveBatchJob("restart")` per reaped job and a `batch reaped` info log when n>0; builds `srv.Batch` from the config (TTL via `ParseDuration`, MaxBytes via `ParseSize`, runner defaults fill the zeros) only when enabled and the store opened; closes `srv.Batch` in both shutdown branches when non-nil. Added a commented `[batch]` block to dist/sift.toml.example. Given test byte-identical; all config and cmd tests pass under -race -count=3. |
 | p6/09-cli-docs | 2026-09-26 | done | 1 | gate: ok | none | `cmd/sift/batchcmd.go`: `parseBatchArgs` (verb + unchanged `rest`; submit takes one arg, status one job id optionally preceded by `--results`, get a job id plus a non-negative-integer idx, cancel one job id, else a usage error), `batchMain` dispatch, one small function per verb, and `batchDo` (bearer header, decode the JSON envelope, print it indented on stdout, on non-2xx print `env["error"]` to stderr and `exitFor`). `submitMain` reads the file or stdin and `buildTargetsBody` accepts a JSON object with a non-empty `targets` array, a bare array of target objects, or a bare array of URL strings (each wrapped `{"url": s}`), validating locally before the call. `main.go`: one `case "batch"` and one help line. README "Batch" section (four endpoints, serial-per-job/one-worker/round-robin model, 32 targets/1-per-caller/8-total caps, 256 KiB body, idempotency, lease/TTL/restart, summary-vs-results, restricted redaction, `sift_batch_*` metrics); SKILL.md "Batch" section. Given test byte-identical; all cmd/sift tests pass under -race -count=3. |
+| p3.1 | 2026-09-29 | done | 1 | gofmt/vet/race ok; make gate blocked by pre-existing staticcheck 0.6.1 vs go 1.26 | none | Native filters + multi-query RRF: Filter on Source.Search, SourceOut.Notes, Tavily auto_parameters false, SearXNG site:/time_range/categories, Brave notes, domain post-filter, Tavily min_score, sequential queries, JSON cache key, CLI flags, skill recipe. §11 tests in p31_*.go and search_filter_test.go. Guard/auth/orion pin untouched. |
 
 ## P5a review (owner, 2026-09-26)