docs: sync docs with code; fix Makefile modules target

Makefile:
- Add reconciler and ingest to the `modules` target; they were only built
  as side-effects of `make node`, making `make modules` incomplete

planning.md:
- Add 4 missing CLI drivers: discovery_cli, config_cli, protocol_cli,
  query_cli (all existed in code and dev/cli/Makefile but were absent)
- Add header-only utilities table: stream_stats.h, v4l2_fmt.h

README.md:
- Add transport_cli, discovery_cli, config_cli, protocol_cli, query_cli
  to CLI tools list

conventions.md:
- Add ERR_NOT_FOUND to Error_Code enum example
- Replace placeholder Invalid_Error_Detail with actual fields
  (config_line, message) that have been in use since config module
- Add missing error macros: APP_INVALID_ERROR, APP_INVALID_ERROR_MSG,
  APP_NOT_FOUND_ERROR
- Update directory structure: node/ description (was "later"), add web/
  and tools/ entries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -15,13 +15,18 @@ Designed to run on resource-constrained hardware (Raspberry Pi capturing raw MJP
 
 - [docs/cli/media_ctrl_cli.md](docs/cli/media_ctrl_cli.md) — media device and topology tool
 - [docs/cli/v4l2_ctrl_cli.md](docs/cli/v4l2_ctrl_cli.md) — V4L2 camera control tool
+- `transport_cli` — send/receive framed messages, inspect transport frame headers
+- `discovery_cli` — announce and discover peers over UDP multicast; print found/lost events
+- `config_cli` — load an INI config file and print the resolved values after applying schema defaults
+- `protocol_cli` — send and receive typed protocol messages; inspect frame payloads
+- `query_cli` — wait for first discovered node, send ENUM_DEVICES, print results
 - `test_image_cli` — generate test patterns and write PPM output for visual inspection
 - `xorg_cli` — display a test pattern in the viewer window; exercises scale/anchor modes and text overlays
 - `v4l2_view_cli` — live camera viewer; auto-selects highest-FPS format, displays FPS overlay
 - `stream_send_cli` — capture MJPEG from V4L2, connect to a receiver over TCP, stream VIDEO_FRAME messages with per-stream stats
 - `stream_recv_cli` — listen for incoming TCP stream, display received MJPEG frames with fps/Mbps overlay
 - `reconciler_cli` — simulated state machine experiment; validate the reconciler with fake resources before wiring into the node
-- `controller_cli` — interactive REPL; connects to a running node; supports enum-devices, enum-controls, get/set-control, start/stop-ingest, start/stop-display
+- `controller_cli` — interactive REPL; connects to nodes by peer index or host:port; enum-devices, enum-controls, get/set-control, start/stop-ingest, start/stop-display
 
 ## Structure