v0.6.8: BotRegistration.project_dir for non-default project layouts (F185)

[firstintent]

Summary

Fixes daemon's inability to find projects that live outside ~/projects/<slug>/. Two real cases this unblocks:

• Projects on NAS / non-home paths (e.g. /vol4/1000/nasworkspace/ccteam).
• Project directory basename differs from workflow slug (dir ccteam, slug research-squad).

Approach

• Additive schema: BotRegistration.project_dir: Option<PathBuf> (serde-default-skip; legacy JSON without the field still parses).
• Resolver fallback: supervisor::bot_dir and inbound::DefaultMailboxResolver prefer reg.project_dir when set; fall back to the historical <projects_root>/<workflow_slug>/.ccteam/chat/<role>/ when None.
• MCP input: chat_register_bot gains an optional project_dir parameter. When omitted, the dispatcher defaults to std::env::current_dir() (canonicalized via std::fs::canonicalize).
• Skill: ccteam-creator Phase 5.6 now passes project_dir (the directory holding .ccteam/workflow.yaml) when registering bots.

No version bump, no migration tooling — pre-v1.0 policy (CLAUDE.md §五 third bullet). Old registrations continue to work via fallback.

Drive-by

e2e_creator_full_path_test carried a stale assertion referencing ## 5.9 Phase 5.9 — that section was renumbered to 5.8 in #146 when the broken ccteam internal daemon ensure-running reference was removed. Fixed here so the workspace test gate is clean.

Test plan

• cargo test --workspace --locked --no-fail-fast --exclude ccteam-web: 1469 pass / 0 F185-related failures. Excluded ccteam-web due to local inotify-busy host hang on ws_* tests (known per CLAUDE.md §六); CI exercises it cleanly. Two remaining transient failures both reproduce on bare main and pass in isolation (cost_summary::t09_memoize_second_call_no_reread — concurrent file-watch race; dm_autoroute::daemon_dm_no_at_mention_auto_routes_to_single_bot — env-race flake CLAUDE.md §六 documents).
• cargo clippy --workspace --all-targets --locked -- -D warnings 0 warning
• cargo fmt --all -- --check 0 drift
• New project_dir_resolve_test.rs: explicit project_dir path used; absent → fallback to projects_root/slug
• Extended chat_register_mcp_test.rs: serde round-trip with new field
• End-to-end test on supervisor + mailbox honors reg.project_dir over projects_root

Acceptance

User scenario:

mkdir -p /vol4/1000/nasworkspace/ccteam/.ccteam
cd /vol4/1000/nasworkspace/ccteam   # creator writes workflow.yaml here
# register bot (skill auto-passes project_dir = $PWD)
ccteam start
# daemon finds /vol4/1000/nasworkspace/ccteam/.ccteam/chat/<role>/ — works

Refs docs/versions/v0-6-8/README.md (F185 will be folded into the version archive in a follow-up sweep alongside the other V0.6.8 additions).