Refresh architecture diagram to match shipped pipeline

The previous diagram still depicted the early-product shape:
five LLM agents (with FitAgent as stage 1), only Greenhouse +
Lever for job search ("12 + 3 indexed boards"), and Markdown
+ WeasyPrint PDF as exports. None of that is current.

Updated the SVG to match the architecture as it's actually
running:

INPUTS column
- Resume input now reads "Upload or chat" with PDF·DOCX·TXT
  and the conversational LLM Q&A path called out (ADR-016).
- Job source is the cached job index — ~12,000 open roles
  across Greenhouse + Lever + Ashby + Workday with a 30-min
  refresh cadence (ADR-013).
- JD card mentions the LLM parser, skill chips, and match score.

5-stage pipeline
- Stage 1 is now "Matchmaker" with a DETERMINISTIC tag (was
  the LLM-driven FitAgent — that role is gone, the
  deterministic build_fit_analysis() service plays this part).
- Stage 2 "Forge" replaces the generic "Tailoring Agent"
  label so it matches the in-product naming.
- Stage 3 "Gatekeeper" replaces "Review Agent" for the same
  reason. Still highlighted amber as the grounded checkpoint.
- Stage 4 is "Resume Gen" (was confusingly labelled "Resume
  Builder" — that name now means the chat-driven intake on
  the input side).
- Stage 5 "Cover Letter" stays gated on review approval.

Outputs
- Both output cards now read "DOCX · PDF" with the two
  shipped themes (`classic_ats`, `professional_neutral`).
  The previous "Markdown · WeasyPrint PDF" line was wrong —
  Markdown export was retired in 2026-05 (ADR-015).

Cross-cutting
- Added a violet "Grounded workspace assistant" panel in the
  output row (with a dashed sweep showing it has access to
  inputs + pipeline outputs) — the chat surface that streams
  state-aware answers (ADR-017).
- Foundation row: replaced the generic "Each agent: det +
  LLM" line with the actual three-layer retry stack +
  per-agent fallback isolation note (ADR-018). Persistence
  row clarifies the cached_jobs index, Postgres RPC, and
  VPS+Vercel deployment shape.

Bumped viewBox height 580 → 640 to fit the assistant + the
expanded foundation copy.

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

Author: LEANDERANTONY