add dolibarr-tva-reconciliation, dolibarr-recurring-templates, dolibarr-data-snapshot

V3 bundle — three sibling skills under .claude/skills/, all read-only,
all depending on the dolibarr base skill.

dolibarr-tva-reconciliation:
- tva-by-month.sh: HT + TVA grouped by (year-month × tva_tx), ready
  for CA3 / CA12 transcription.
- tva-line-detail.sh: per-line audit trail with country-based bucket
  assignment (A1 domestic / A4 intra-UE autoliquidation / E2 export
  hors UE). Documents the French TVA mental model.
- Today every Arcodange line is E2 (KissMetrics, US, autoliquidation
  259-1° CGI). The skill scales for the day a French B2B is invoiced.

dolibarr-recurring-templates:
- list-templates.sh: probes /invoices/templates/{id} since there's no
  list endpoint. Stops after 5 consecutive empty responses.
- inspect-template.sh: full audit per template, with health checks.
- Surfaces that the "Kiss Metrics Invoice" template has frequency=0
  and nb_gen_done=0 — it is NOT auto-firing. Every KM invoice today
  was manually duplicated. Cohort-review implication: the deferred
  9-month cycle depends on Gabriel clicking "Generate" each month,
  not on a Dolibarr cron.

dolibarr-data-snapshot:
- snapshot.sh: bundles every read endpoint the dolibarr-* family uses
  into one JSON with a content_hash (sha256 of data only, excluding
  timestamp — so identical state hashes identically across runs).
- Use cases: cohort evidence packs, drift detection, archival before
  a known-risky UI change.
- V1 baseline summary captured at examples/snapshot-summary.txt
  (the ~246 KB snapshot file itself is intentionally not committed).

Also extends dolibarr/SKILL.md endpoint catalogue with
/invoices/templates/{id} (and its no-list-endpoint quirk + the
id-null sentinel for missing ids), plus links to the three new
sibling skills.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/skills/dolibarr-recurring-templates/examples/inspect-template-1.txt

@@ -0,0 +1,26 @@
+================================================================================
+ Template 1 — Kiss Metrics Invoice
+================================================================================
+  Customer       : socid=1
+  Schedule       : frequency=0 m    (OFF — manual generation only)
+  Counts         : generated=0 / max=unbounded
+  Next fire date : (unset)
+  Last fire date : (none)
+  Suspended      : False
+  Auto-validate  : False
+  Generate PDF   : True
+  Payment terms  : mode=VIR  cond=10DENDMONTH (Due in 10 days, end of month)
+  Totals         : HT=5100.00000000  TVA=0.00000000  TTC=5100.00000000
+  Bank account   : fk_account=2
+
+  Lines:
+    - ref=KM-cloud-devops  qty=10  subprice=510.00000000  tva=0.0000  HT=5100.00000000
+        TVA non applicable – Article 259-1 du CGI – Prestation de services localisée hors de France (USA)
+
+  Generated children (by note_private match on 'Kiss Metrics Invoice'):
+    - 2026-02-24  id=  12  FAC002-CL0001002          HT=5100.00000000  paye=1
+    - 2026-02-24  id=  13  FAC003-CL0001003          HT=2550.00000000  paye=1
+
+  Health checks:
+    [!!] frequency=0 — template is NOT auto-generating; every child was created manually
+    [!!] nb_gen_done=0 but 2 child invoice(s) match by note — they were duplicated, not auto-generated