Check-in [ad1d55f5b9]

* feat(leaf/agent): clone-if-absent via Config.CloneFromHubURL (#137 gap A)

Adds agent.Config.CloneFromHubURL — when set and Config.RepoPath does not yet exist on disk, agent.New clones the leaf repo from the hub HTTP URL before opening it. Matching project-codes between leaf and hub are required for downstream NATS sync subjects to align, so callers that need to bootstrap a leaf against an existing hub no longer have to import libfossil directly for the pre-agent clone step.

Also exposes agent.CloneRepo(ctx, repoPath, hubURL) as a standalone helper for callers that need a clone independent of agent construction.

Existing behavior is preserved: when CloneFromHubURL is empty, agent.New errors on missing RepoPath as before (covered by TestAgentNew_RejectsMissingRepoWithoutCloneURL).

Closes part of #137 (gap A — bones internal/coord/leaf.go).

* feat(hub): subscribe to fossil-sync NATS subject in NewHub (#137 gap B)

NewHub now connects a local NATS client to its embedded server and subscribes to "fossil.<project-code>.sync" so peer leaf agents can push xfer requests to the hub over NATS — alongside the existing HTTP path. Previously, achieving this required running a leaf-agent in serve mode on top of the hub (Pull=false, Push=false, Autosync=AutosyncOff, ServeNATSEnabled=true), which transitively pulled libfossil into the consumer's import graph.

The subscriber is enabled by default. Read-only HTTP-only mirrors that shouldn't accept NATS pushes can opt out via Config.DisableFossilSyncOverNATS.

Note on naming: the issue brief proposed Config.ServeFossilSyncOverNATS defaulting to true. Go bool zero-value semantics make default-true awkward without pointers, so the inverted-name shape (DisableX, defaults false = enabled) was used instead.

Closes part of #137 (gap B — bones internal/coord/hub.go).

* feat(hub): FileToCommit.Perm + CommitOpts.Time pass-through (#137 gap C)

Adds two additive fields to the public hub commit surface so consumers no longer need libfossil-direct access to preserve executable bits or seed reproducible commit timestamps:

- hub.FileToCommit.Perm — "x" marks the file executable on the resulting manifest's F-card. Empty preserves prior behavior. Other libfossil perm markers pass through verbatim. - hub.CommitOpts.Time — explicit commit timestamp; zero defaults to time.Now().UTC() at commit time, matching the prior behavior.

Tests cover round-tripping the executable bit via libfossil.Repo.ListFiles, honoring an explicit time via Timeline, and falling back to "now" on the zero value.

Closes part of #137 (gap C — bones internal/hub/hub.go seed path).

* ci: include #137 sim tests in the serve-tests allowlist

Adds TestAgentNew_ and TestHubNATSFossilSync_ to the sim serve-tests regex in both Makefile and test.yml so the new clone-if-absent and hub-NATS-subscriber tests actually run in CI alongside TestHubLeafE2E. check-in: ad1d55f5b9 user: [email protected] tags: trunk, leaf/v0.0.10