Add CONTEXT.md index and context-loading task

First use of the CONTEXT.md pattern — thin index pointing to
context/ topic files, loaded by context-load at session start.

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

CONTEXT.md

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+# Context — claude-foundations
+
+Current work focus and active tasks. Used by `context-load` to orient agents at session start.
+
+## Active
+
+- [Context loading improvements](context/context-loading.md) — Testing and refining the `context-load` and `start-claude` scripts

context/context-loading.md

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+# Context Loading Improvements
+
+## Status
+In progress — testing and iterating.
+
+## What exists
+- `scripts/context-load` — Walks from cwd upward, loads CLAUDE.md, CONTEXT.md, MEMORY.md, BESTPRACTICES.md files, directory trees (depth 3), cwd `*.md` files, and git-status-report output. Deduplicates via symlink resolution.
+- `scripts/start-claude` — Wrapper that runs `context-load` and passes result via `--append-system-prompt` to the `claude` CLI.
+- Both symlinked into `~/sbin/`.
+
+## What to test
+- Run `start-claude` from different project directories and verify context is complete and correctly ordered
+- Check token budget — is the output too large for some projects?
+- Verify CONTEXT.md and BESTPRACTICES.md are picked up when they exist
+- Confirm git-status-report output is clean (no ANSI artefacts)
+
+## Future direction
+- CONTEXT.md will be the primary mechanism for orienting independent agents running in Docker containers
+- Each agent gets the full context load, with its starting prompt pointing to the relevant CONTEXT.md entry