Ingest Triage - conflict classification and resolution

This skill is loaded in two contexts:

• By a Stage 3 WorkUnit agent when sl_discover, deterministic projection output, existing project memory, or prior provenance overlaps with what the current WorkUnit is about to write.
• By the Stage 4 reconciliation agent for cross-WorkUnit sweeps, accepted patch overlap, and eviction decisions.

Apply the rules below before every write that could collide with an existing artifact.

Decision tree

1. Is this the same artifact I'm producing now, or a different one with the same name? Read both. If names match and content matches (modulo whitespace): no conflict - skip the write, the prior one stands.

2. If content differs, is it an expression-only change (e.g. a different sql: body for the same measure name, same grain, same columns)? Re-ingest change (expression-only): silently replace via sl_edit_source. No flag.

3. If the difference is structural - grain, columns, filter, join shape - is the current bundle the re-ingest of a previously-ingested bundle (i.e. priorProvenance has a row for this raw file and artifact)? Re-ingest change (semantic break): replace + flag. Record in the IngestReport's conflicts_resolved list with flagged_for_human: true.

4. If reconciliation sees accepted patches from this same job with no prior-sync row, check for same-ingest contradictions:

   Kind	Detection	Resolution
   Structural duplicate	Same name, near-identical expression	Elect canonical by: (a) highest inbound-ref count from other sources; tiebreak: (b) lexicographically first unit key; (c) lexicographically first source name. Subsume losers into <canonical>-variants.md wiki page. Do NOT flag unless ambiguous.
   Near-duplicate cluster	Different names, overlapping shape (same table, similar formulas)	Same as structural; one canonical, others subsumed. Flag only if no canonical emerges.
   Definitional contradiction	Same name, substantively different formulas (different aggregation, different filters, different columns)	Rename + capture: disambiguate ALL variants with suffix derived from the domain (churn_risk_engagement_based, churn_risk_billing_based) and write a unified wiki page listing every variant with provenance. The contested name does NOT land in the SL. Always flag.

5. Eviction (Stage 4 only): for each entry in eviction_list():

   • Remove the artifact (sl_write_source or sl_edit_source with delete: true for SL sources, wiki_remove for wiki pages).
   • Record the removal with emit_eviction_decision and action: "removed".

Why same-ingest vs re-ingest differs

Within ONE bundle there's no user signal telling us which duplicate wins - we capture all variants and flag. Across bundles, re-uploading IS the signal that the new state is intended - we replace silently for expression changes and flag for semantic breaks.

Naming disambiguation hints

When you rename to disambiguate, prefer domain suffixes that match the containing view/table/collection name: customers.churn_risk_score → customers.churn_risk_engagement_based (if the customer_churn view computes it from engagement); billing.churn_risk_score → billing.churn_risk_billing_based. Avoid numeric suffixes (churn_risk_1, churn_risk_2) - they disclose nothing.

Applying canonical pins

When the Stage 4 system prompt includes a <canonical_pins> block, treat each pin as a prior user decision for that contestedKey.

• If the pinned canonicalArtifactKey is present in the Stage Index or already exists in SL, keep it as the canonical artifact for that contested key.
• Disambiguate competing artifacts instead of using the contested name for them.
• Do not flag the pinned contested key solely because the variants disagree; the user has already chosen the canonical artifact.
• If the pinned artifact cannot be found and no current WU can recreate it, emit emit_conflict_resolution with flaggedForHuman: true and explain that the pin references a missing canonical artifact.

When a pin applies cleanly, call emit_conflict_resolution with kind: "definitional_contradiction", artifactKey set to the pinned canonicalArtifactKey, detail describing the pinned election, and flaggedForHuman: false.

What to write in the unified wiki page

When you perform rename + capture, also write one page named <canonical-concept>-definitions.md under the wiki GLOBAL scope. Structure:

• One heading per variant, referencing the disambiguated SL name.
• One paragraph per variant: what it computes, where it came from (raw file + line range), when to use it.
• A closing "Choosing between these" paragraph if the variants are legitimately domain-specific.

Do not attempt to rank variants or pick a "best" - that's user-override territory.

Silence rules

Flag for human review when:

• You did rename + capture for a definitional contradiction (kind 3 above).
• You performed an eviction retention (kind 5, second row).
• An override constraint (from a Stage 4 re-run) conflicts with current inbound refs.

Do NOT flag:

• Same-content duplicate skip (trivial).
• Structural duplicate with clear canonical election.
• Expression-only re-ingest replace.