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/SKILL.md

@@ -93,7 +93,8 @@ Read-only endpoints we've validated against this instance. Live captures are und
 | `GET /bankaccounts` / `/{id}`                  | 200  | List bank accounts / detail          | Returns `ref`, `label`, `iban`, `country_code`. `fk_bank_line` on a payment doesn't directly map to the account id — see `dolibarr-payments-state` skill for the lookup. | [bankaccounts_list.json](examples/bankaccounts_list.json) |
 | `GET /thirdparties`                            | 200  | List thirdparties                    | `mode` MUST be integer (`mode=1` = customers). String fails 400. | (use `/{id}` below) |
 | `GET /thirdparties/{id}`                       | 200  | Thirdparty detail                    | KissMetrics is `id=1` in this instance                           | [thirdparty_km.json](examples/thirdparty_km.json) |
-| `GET /products` / `/products/{id}`             | 200  | Product catalogue                    | `KM-audit` is `id=1`                                             |  — |
+| `GET /products` / `/products/{id}`             | 200  | Product catalogue                    | `KM-audit` is `id=1`, `KM-cloud-devops` is `id=2`                | [products_list.json](examples/products_list.json) |
+| `GET /invoices/templates/{id}`                 | 200  | Recurring invoice template detail    | **No list endpoint** — probe ids 1..N. Empty ids return HTTP 200 with `id=null` (sentinel for "doesn't exist"). Fields: `ref`, `socid`, `frequency`, `unit_frequency`, `nb_gen_done`, `date_when`, `date_last_gen`, `suspended`, `auto_validate`, `lines`. | [invoice_template_km.json](examples/invoice_template_km.json) |
 | `GET /documents/download`                      | 200  | Download a stored document as base64 | `modulepart=facture&original_file=<REF>/<REF>.pdf` (URL-encode slashes). Returns `{filename, content-type, filesize, content}` with `content` base64. | [document_download_meta.json](examples/document_download_meta.json) |
 
 Not available on this account (intentionally): `/setup/modules` (admin-only), `/invoices/templates` (requires a path arg — different route shape; V2).
@@ -135,6 +136,9 @@ Not available on this account (intentionally): `/setup/modules` (admin-only), `/
 
 - Workflow skill for invoice + thirdparty audits: [dolibarr-invoice-audit](../dolibarr-invoice-audit/SKILL.md).
 - Workflow skill for payment-state and cash-receipt tracking: [dolibarr-payments-state](../dolibarr-payments-state/SKILL.md).
+- Workflow skill for monthly TVA basis (CA3 / CA12 preparation): [dolibarr-tva-reconciliation](../dolibarr-tva-reconciliation/SKILL.md).
+- Workflow skill for recurring invoice templates: [dolibarr-recurring-templates](../dolibarr-recurring-templates/SKILL.md).
+- Workflow skill for point-in-time state archival: [dolibarr-data-snapshot](../dolibarr-data-snapshot/SKILL.md).
 - Future workflow skills follow the `dolibarr-<topic>` convention. Each one depends on this skill for connection + permissions + endpoint reference; each one keeps its triggers focused on its specific business workflow.
 
 ## Out of scope