Lab #2366: s3/gcs datastore: directory dirty paths map to the wrong index shard, so 3+ segment model types re-upload their whole history on every write

Found while triaging swamp-club#2353. Extension-side (@swamp/s3-datastore and @swamp/gcs-datastore; the code is identical in s3_cache_sync.ts and gcs_cache_sync.ts).

Problem

partitionKeyFromPath derives an index shard key from the segment count of a path. File paths map consistently, but a directory relPath lands on the wrong shard: the segment count of a directory cannot be told apart from a file's, and model types of different depths put the model id at different depths.

A data-name directory for a 3+ segment type (for example data/@test/aws/ec2//) maps to data--@test--aws, which is not a real partition. Version files live in data--@test--aws--ec2-- and latest markers in data--@test--aws--ec2.
Core signals the data-name directory on every data write (save, append, allocateVersion), because the version is not allocated yet at notify time.
assembleDirtyShardsOnly therefore loads an empty index, the scoped walk stats the directory, and fileNeedsPush returns true for every file, since there is no index entry.

Evidence (localstack, swamp 20260922, s3-datastore 2026.09.22.2)

A @test/aws/ec2 model writing one resource per run pushed 11, 16, 22, 28, then 34 files per run. Version 1's LastModified changed on every run. A command/shell control stayed flat at 13 per run: 2-segment types only re-upload latest each time. The same happens for the delete-all fallback in core, which still sends a data-name directory when version enumeration fails.

Fix

A directory relPath must load every partition that can hold entries under it: any partition whose key is a double-dash prefix of the path, or has the path as a double-dash prefix. This widens the directory-walk delete check (index entries under the directory with no local file), which has never fired for 3+ segment types, so it needs its own tests.

Removals no longer depend on this mapping once the swamp-club#2353 core change lands, because core then sends file-level paths. Writes still do.

Registry: bump @swamp-club/extension-scoring to the version carrying #3983 (and #3845) before the v5 rescore

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serve: dispatch to an idle worker waits for its worker_busy write on the shared gateway transition tail

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Rescore every extension's current version under rubric v5

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Support creating 1Password vaults for new clients

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telemetry stats says "No telemetry data found" right after successful sends; say the spool is empty because it flushed

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Extension registry page: a supported way to include media (images) in the README

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Finer-grained method locking: a long-running method on one definition blocks unrelated objects managed by the same definition

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Workflow run cancellation on concurrency-key conflict

Read non-string sensitive resource fields back with their type

Run index repair-by-stat misses an in-place, same-size record rewrite that restores mtime within the same second as its entry: ctime is reported in whole seconds

Configurable storage tiers: runs, outputs, data versions and audit move through an ordered list of user-defined tiers, and stay queryable across them

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serve: the per-IP WebSocket burst limit can't be configured, so workers behind one NAT IP throttle each other

S3-backed serve: a poll that pulls one file invalidates the whole data catalog, so the next query re-reads every version

extensions_search index is never created if the first attempt fails, until the process restarts

S3/GCS datastore sync: shared sync service lets one sync clear another's dirty marks and pull over unpushed files

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s3-datastore: first push on a fresh cache prints 'Index merge failed' for a missing local .datastore-index.json

swamp-extensions: use explicit npm:/jsr: specifiers in root extensions/models

stagecraft: studio state_test 'after its event stream reconnects' is timing-flaky under load