Normalize issue ids in relation getters

[mkwlsn]

GetIssue normalizes a bare id, but six relation getters do not. A caller that passes the raw argument resolves the issue and then silently gets nothing back for its relations.

Repro

td show abc123      # resolves, but omits handoff, session log, git state, blocking edges
td show td-abc123   # complete record

Both return the same issue with an identical first line. On a real issue the bare form printed 24 lines and the prefixed form 53. There is no error, and the output ends cleanly on SESSIONS INVOLVED, so it reads as a complete record. A blocked issue shows no blocker.

Root cause

cmd/show.go:113 keeps the raw argument:

issueID := args[0]

GetIssue on line 138 succeeds because it normalizes its own local copy, so issueID is still bare. Lines 144 to 158 pass it to GetLogs, GetLatestHandoff, GetLinkedFiles, GetDependencies, GetBlockedBy, and GetStartSnapshot. Each queries abc123 against rows keyed td-abc123 and returns empty. Each call discards its error with _, so nothing surfaces.

The fix

Normalize in the six getters, matching how AddComment, AddHandoff, and about forty other call sites in internal/db already do it.

I went with the DB layer rather than issueID = issue.ID at the callsite because the callsite fix leaves the next caller of these getters exposed to the same bug. Happy to switch to the one-line version if you would rather keep normalization at the CLI boundary.

Relationship to #199

#199 named GetLatestHandoff(issueID) as part of this defect. Its write paths now normalize, so td comment abc123 succeeds and stores td-abc123 correctly. The read path it described was still open, and that is what this fixes. I have not used a closing keyword since the scope of that issue is yours to judge.

Tests

internal/db/bare_id_relations_test.go covers GetDependencies, GetBlockedBy, and GetLogs, asserting the bare and prefixed forms agree. Without the change it fails:

bare id returned 0 deps, prefixed returned 1; the two must agree
bare id returned 0, prefixed returned 1; the two must agree
bare id returned 0 logs, prefixed returned 1; the two must agree

make fmt clean. make test green across all packages, including the e2e suite.

Note on scope

td dep add still rejects bare ids with FOREIGN KEY constraint failed, which is a loud failure rather than a silent one, so I left it alone. Worth deciding separately whether bare ids should be accepted uniformly or rejected uniformly. Right now td dep and td tree accept them, td dep add rejects them, and td show accepted them while quietly returning less.