Add compact investigation working view with resolved source evidence

docs/investigation-working-view-v2.md

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+# Investigation working view v2
+
+New project-enabled investigation states freeze `prompt_protocol=2`. Existing
+states without that marker retain their original prompts, request hashes,
+contexts and budgets. Non-project loops retain their previous protocol. No
+migration or rewriting of historical evidence is performed.
+
+## Complete archived context
+
+The canonical case, accepted interpretation, full investigation state, ledger,
+evidence records and contents remain archived. New contexts additionally load
+the accepted interpretation context and check its SHA-256 against the confirmed
+interpretation. Its source aliases include separately captured entity-resolution
+facts (e.g. F0029 in the reference trial); these were previously missing from the
+loop's canonical-case-only input. No additional database or model call is needed.
+
+## Model working view
+
+- Case identity and all readable interpretation-context source aliases replace
+  the duplicated canonical case. No readable observation, description, fact or
+  resolved identity is filtered by relevance or age.
+- Source IDs address full archived provenance. Repeated archive/JSON navigation
+  is omitted from top-level source provenance in the model view; authors,
+  timestamps, attribution kinds and other semantic origin fields remain. Raw
+  query values, predicates, rows, truncation and snapshot scope remain available.
+- The first 12 source/database reference entries retain the previous project's
+  bounded metadata-catalog behavior. Counts, truncation and unlisted source IDs
+  are explicit. Identical file metadata is listed once with all source IDs.
+  Raw file inventories are not observations and cannot prove absence. All file
+  metadata remains in the archived context. Project repository/DB searches do not
+  depend on this bounded packaged-file catalog.
+- The selected hypothesis retains its full proposal, live questions and notes.
+  Alternatives retain mechanism, distinction, falsifying evidence, live state,
+  questions, notes and evidence references. Initial open_questions are not sent
+  twice because the live question list already contains them.
+- Current balances, policy, low-information counters and pending actions remain.
+  Settled actions become a count in the model view; global novelty hashes remain
+  the controller's responsibility. Ledger calculations do not use this view.
+- Evidence content from ALL hypotheses remains readable, including negative and
+  cross-hypothesis findings. Internal novelty atoms are omitted; semantic source
+  content, query scope, completeness and provenance remain. The previous result
+  is referenced once through its evidence ID.
+- Long storage identifiers and repeated provenance use the existing deterministic
+  P/M encoding. The duplicate project query schema is omitted from project
+  binding metadata; allowed arguments remain in the full output schema.
+
+Known P aliases in tool `source_ref`/`source_refs` arguments are expanded from
+this exact working context before the normal preparation, permission checks,
+budget reservation and execution. Only these fields are expanded; database
+filters and search text are never rewritten. Unknown aliases are not resolved
+and still face the existing tool validators. Raw model replies remain archived.
+
+## Measurement and limits
+
+On the current compact-hypotheses-20261015 first-step input, initial messages fall
+from 83416 to 56063 characters (32.8% fewer), while restoring missing resolved
+identity evidence. This is an offline character comparison, not actual provider
+tokens or a demonstration of live model quality.
+
+This is the first safe reduction, not a constant-size research memory. Old result
+payloads can still grow with investigation length. They are deliberately NOT
+silently truncated, discarded or replaced by an LLM summary. Further reduction
+of those payloads requires a separate reliable read-back mechanism and tests for
+retaining old counterevidence. No paid investigation was started by this change.