docs(diagrams): correct stale and inaccurate claims across diagrams and docs

The nine diagrams had drifted from the code since they were generated. Redrew
them and brought every doc that describes them back in line.

Diagrams:
- Drop "100% recall" wording the project itself disavows (README now calls
  recall 1.0 a circular, graph-derived upper bound); lead the benchmark board
  with the ~82x median rather than the 528x best case.
- Blast radius: DEPENDS_ON is only emitted for Ansible roles and Solidity
  `using`, so a function reaching a class is CALLS. Impact propagates against
  stored dependency edges, so every node in the radius must be a caller --
  class-shaped nodes replaced with caller-shaped ones, CALLS arrowheads
  flipped to point at the changed node, and a 3-hop node re-parented inside
  the 2-hop default. 2 is the default depth, not a cap.
- Impact traversal is a weighted best-path relaxation, not BFS.
- Incremental update: unchanged dependents are hash-skipped, so only edited
  files re-parse; dependents come from graph edges, not SHA-256.
- 1,326 was the embeddings count; the node count is 1,418.
- Add CodeBuddy Code (15th platform) and correct OpenCode to opencode.jsonc.
- Add 11 missing languages; note that not every language emits all six
  extraction kinds.

Docs:
- README said dependents are found "via SHA-256 hash checks" -- they come from
  import/call edges; SHA-256 decides what to skip.
- Drop the unsupported 27,700-file monorepo claim (no benchmark backs it) and
  cite what the diagram actually measures.
- Translated READMEs still carried retracted numbers (8.2x, 4.9x-27.3x, and a
  literal "100% recall" in zh-CN) and alt text for a Next.js diagram that no
  longer exists.
- Fix Zed and Continue config paths, which pointed at project-local files the
  installer never writes.
- Document the 4 undocumented edge kinds and 3 undocumented node kinds.
- Note that the fastapi benchmark row predates its config re-pin.
- Add the Trendshift badge to all translated READMEs.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JNv8JqBb46stATZYUinQtn