Classify register 5: reckon's Navigational Principles

[pentaxis93]

Closes #2.

Classifies the fifth source register — tesserine/groundwork skills/reckon/SKILL.md §Navigational Principles — and lands its unique content. After this, no principle reckon directs reasoning from is homeless. Unblocks tesserine/groundwork#387 (gated on this landing).

Classification

Item	Classification	Destination
Preamble	retained	Deployment mechanics — reasoned with, not from
1. Parsimony	ascended	Parsimony (the razor); "one mechanism" homonym disambiguated against Single Home in both documents
2. Elegance	projection (split)	Derivation clause → Grounding projection form follows the problem; nothing-imposed clause → Parsimony's elegance face
3. Sufficiency	ascended	Parsimony (sibling of the disciplined-completeness clause)
4. Traceability	ascended	New 13th universal (principles/traceability.md, Movement I, dual with Grounding, kin to Verifiable Completion)
5. Independence	ascended	Grounding (adjacent solutions are evidence, not templates)

The classification was produced twice independently and converged; the one fork — Traceability's home — was decided by the operator: mint the universal. The corollary route fails the derivability test: reckon's grounded-then-analogical corruption mode documents reasoning that satisfied Grounding fully and still failed ("correct position, analogical momentum"), and no existing universal's recognition block catches mid-chain drift.

Acceptance criteria

1. Register 5 section in SOURCES.md, every item classified with destination/reason — six rows (preamble + 5 items), each with exactly one classification.
2. Landed content follows corpus conventions — every projection/merge names its source register item; Relations and Sources updated in traceability.md (new), grounding.md, parsimony.md, single-home.md, verifiable-completion.md. Dual and kin edges are symmetric on both ends.
3. README topology — Movement I gains Traceability with its movement; counts updated (thirteen universals, five registers); the No-Ground failure diagnostic gains untraceable chains; Provenance records the fifth register.
4. Reasoning traceable to the discriminator — stated in each SOURCES.md row (reasoned-from invariant vs. methodology instrument; the homonym discriminator "must the two agree?"; the corollary-derivability test for the new universal).

Verification

• All relative links in changed files resolve to files on disk.
• 13 files under principles/; README says thirteen; topology table lists all 13.
• Reverse traversal holds: destination documents cite the reckon register items; SOURCES.md rows link to destinations.