syncro skill: timer-entry-first workflow + heredoc payloads

- Promote timer_entry → charge_timer_entry to default billing path; demote
  bare add_line_item to a clearly-labeled fallback for non-time items only.
  Mike caught the bare-add_line_item bug across 31 tickets on 2026-04-30;
  repeated on 3 tickets 2026-05-01. Time entries are required for Syncro
  reporting (hours per client, tech productivity, prepay burn).
- Replace /tmp/*.json payload pattern with heredoc throughout. /tmp resolves
  to C:\tmp\ in the Write tool but %LOCALAPPDATA%\Temp\ in Git Bash on
  Windows — different real directories. Caused a wrong-comment incident on
  ticket #32225 2026-05-01 (rogue payload from prior session). Heredoc
  avoids the file handoff entirely.

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

.claude/memory/MEMORY.md

@@ -31,6 +31,7 @@
 - [1Password — always use service token](feedback_1password_service_token.md) — Source OP_SERVICE_ACCOUNT_TOKEN from SOPS for every `op` call. Desktop-app integration prompts are unacceptable in agent flows.
 - [/tmp path mismatch on Windows](feedback_tmp_path_windows.md) — Write tool and Git Bash resolve `/tmp` to DIFFERENT real dirs. Use heredoc or workspace path for JSON payloads handed to curl. Caused wrong-comment incident on Syncro #32225.
 - [Syncro — never set contact on Cascades tickets](feedback_syncro_cascades_contact.md) — Cascades tickets must have `contact_id` blank; Syncro routes to the correct email distribution that way. Setting contact (often defaults to Meredith) overrides and breaks notifications. Never include the contact field in create or edit payloads for Cascades.
+- [Syncro — log time entries first, never bare add_line_item](feedback_syncro_timer_first.md) — All Syncro work-time billing MUST go through `timer_entry → charge_timer_entry`. Bare `add_line_item` leaves Syncro time tracking at 00:00:00 and breaks reporting. Mike caught this on 2026-04-30 across 31 tickets; I repeated the bug on 2026-05-01 across 3 more.
 
 ## Machine
 - [ACG-5070 Workstation Setup](reference_workstation_setup.md) - Windows 11 Pro clean install 2026-03-30, replaced CachyOS. All tools installed.