DD-338 Phase A.2 (narrowed) — syncthing-blade-mcp catalog flips for list_folders + recent_changes cat-B promotion

[piersdd]

Summary

Lockstep catalog change with Groupthink-dev/syncthing-blade-mcp#5
for the 2 cat-B tools whose runtime gains a scope= argument + filter
via the A.1 _resolve_scope_folders substrate + _meta envelope:

• syncthing_list_folders — scope_filtering: none → server-side;
  audit_surface: minimal → structured; description appended with the
  DD-278 scope= tag + SYNCTHING_<SCOPE>_FOLDERS env-var contract +
  _meta envelope tail note.
• syncthing_recent_changes — same two granularity flips +
  description appended noting the data.folderID post-fetch filter shape.

Catalog version: 0.6.1 → 0.7.0 (minor — behaviour-affecting scope=
arg added per A.1 + B.1.b minor-bump precedent).

Scope narrowing per architect amendment 2026-05-23

The original spec covered 34 tools across 3 blade-mcp catalogs (tailscale

• syncthing + mastodon). Architect narrowed scope to just the 2 cat-B
  tools after discovering that non_conformance_rationale.scope_filtering_unspecified
  is not a pack-spec v4.4.0 field — scope_filtering: none IS the
  conformant declaration for tools without a scope dimension. The 32
  cat-A (honest scope_none) + cat-D (write verb) tools in the original
  spec are already conformant; no edits to those rows.

Test plan

• npm test green: 164/178 (14 skipped, 0 failed) — covers AJV
  schema validation + pack/catalog conformance + DD-120 sealed gates +
  domain-scope + non-conformance rationale checks.
• node scripts/build-forge-context.js runs clean (regenerates the
  declared-services build artefact that npm test consumes).

Convention compliance

• Convention DD-338 Phase B.1.b — google-home deterministic_ordering: unstable → stable on 6 rows #17: one Co-Authored-By: trailer, no Signed-off-by.

Closes part of DD-338 Phase A.2.

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