chore: use DOC_ROOT for requests path and drop the consumer-repo reference

[poxet]

Two corrections to .claude/mission.md.

1. Incoming requests was a literal path

- **Incoming requests**: `c:\Users\danie\SynologyDrive\Documents\Notes\Tharga\Requests.md`
+ **Incoming requests**: `$DOC_ROOT/Tharga/Requests.md`

Every other reference in this file already used $DOC_ROOT; this one line did not. A hard-coded path resolves on exactly one machine and silently finds nothing everywhere else — and "silently finds nothing" is indistinguishable from "nothing was pending", which is the failure mode that matters for a startup check.

2. The Eplicta reference is removed

- **Eplicta requests**: `$DEV_ROOT/Eplicta/plan/requests.md` — check for requests from Eplicta on startup

A Tharga project should not reference a consuming product's repository at all. External consumers file GitHub issues on this repo, and the outbound duty is a comment on that issue — not writing status back into their files.

This one was also already broken: the file it named does not exist, at that path or anywhere in the Eplicta checkout. Replaced with a line stating the actual channel, so the reference is not reintroduced later.

Related

The same policy is now written into shared-instructions.md under Feature Requests (cross-project) → External consumers, and the "update any consuming project's request file" bullet in Closing a feature has been replaced by "comment on the GitHub issue".

Nine other Tharga sub-projects still carry one or both of these problems — reported separately, not touched here.

[poxet]

Superseded by #64, which carries this change together with the version bump and the comment cleanup in a single PR.