Document the v1.7.0 release

docs/releases/v1.7.0.md

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+# Narratio v1.7.0
+
+Narratio v1.7.0 completes the maintainability refactor begun after v1.6.0. It
+simplifies filesystem and process handling, makes resumable work more precise,
+replaces legacy local and remote state with explicit authorities, and turns
+cleanup into the final ordinary pipeline stage.
+
+## Summary
+
+The session manifest is now the sole durable local progress ledger. Analyze
+checkpoints successful artifacts individually, allowing an interrupted or
+partially failed analysis to resume at the first incomplete artifact without
+rerunning successful siblings unless forced.
+
+Remote publication now commits immutable run state before advancing one
+verified current pointer. Publish locks are independent per-source objects;
+locked outputs retain their previously committed declarations rather than
+being overwritten or silently omitted. Local cleanup runs after notification
+as a separately recorded, safely retryable stage.
+
+The release also adopts Go 1.26, simplifies ordinary file operations around
+Narratio's trusted group-owned workspace model, improves subprocess lifecycle
+handling, decomposes several large orchestration and validation components,
+and removes mutable global test seams.
+
+## Compatibility
+
+This is a minor release with deliberate removal of compatibility paths that
+were deprecated and documented as subject to removal:
+
+- Campaigns must use one versioned `narratio.party.v1` `party.yml`. Separate
+  players files, session-level party overrides, and unversioned party documents
+  are rejected.
+- Session manifests must declare `schema_version:
+  narratio.session-manifest.v1` and satisfy the current strict schema. Older
+  unversioned state and manifests containing the retired
+  `post_publish_cleanup` obligation are rejected rather than migrated.
+- Remote current state must be selected by
+  `current/commit-pointer.json` and its referenced immutable run commit. Legacy
+  current-state layouts are no longer inferred.
+- The retired aggregate `locks.yml` object is ignored. Publish locks now live
+  as independent strict objects under the session lock prefix.
+- Run manifests are no longer produced or consumed. The session manifest owns
+  durable stage progress; invocation summaries and run workspaces remain
+  operational data rather than a second progress authority.
+
+The CLI and current pipeline/configuration formats otherwise remain compatible.
+Building and maintaining Narratio now requires Go 1.26. Cross-built Linux,
+macOS, and Windows assets remain available for `amd64` and `arm64`.
+
+## Upgrade
+
+Before upgrading a campaign that still uses compatibility data:
+
+1. Replace legacy party/player inputs with the documented
+   [`narratio.party.v1`](../integrations/party.md) campaign roster.
+2. If a local manifest contains an outstanding `post_publish_cleanup`
+   obligation, complete it with the pre-upgrade binary. Otherwise verify the
+   remote commit, move aside or regenerate the incompatible manifest, or
+   restore a verified committed snapshot. Do not migrate state by manually
+   editing JSON.
+3. Republish sessions that do not yet have a valid immutable run commit and
+   `current/commit-pointer.json`; legacy remote layouts are not current state in
+   v1.7.0.
+4. Recreate any required publication locks with `narratio session locks add`.
+   After verifying the new locks and publication behavior, the ignored legacy
+   `locks.yml` object may be removed manually.
+
+Existing compatible session manifests and already committed remote snapshots
+need no special action. Consult [Operations](../operations.md) and
+[Troubleshooting](../troubleshooting.md) for recovery procedures.
+
+## Changes
+
+- Upgraded the maintained development and release baseline to Go 1.26.
+- Reworked subprocess execution and Windows process-tree supervision while
+  preserving contextual wait and cleanup failures.
+- Replaced custom confined ordinary I/O and directory-promotion machinery with
+  simpler standard-library operations while retaining bounded reads, atomic
+  single-file visibility, workspace modes, validated downloads, and
+  root-confined destructive operations.
+- Removed legacy party, manifest, artifact-discovery, remote-current, and lock
+  compatibility paths.
+- Consolidated durable progress in the session manifest and removed the run
+  manifest domain model.
+- Unified runner planning and execution decisions, separated invocation
+  lifecycle responsibilities, and avoided creating empty run workspaces for
+  fully reused or cleanup-only invocations.
+- Added per-artifact analyze execution, checkpointing, reconciliation, and
+  recovery.
+- Decomposed configuration validation by domain and made validation diagnostics
+  deterministic without treating incidental ordering or wording as a contract.
+- Introduced immutable remote publish commits, one final current pointer,
+  explicit output planning, safe cross-run carried outputs, and independent
+  per-artifact remote locks.
+- Added `cleanup` as the final canonical stage after `notify`, with validated
+  publish evidence, safe retry, explicit selection, and no separate cleanup
+  obligation.
+- Replaced mutable command test hooks with invocation-scoped dependencies and
+  improved structural test diagnostics.