docs: print the open backlog as a table at session startHEADmaster

Extends the reconciliation step rather than adding a second one: after
diffing the user's notes against the backlog, render what is open as a
table with a short description, the size, and one note saying what
decides whether the item can be picked up now.

Then stop. The user picks. Recommending a single item reads as though
the choice were already made.

Defects are flagged apart from enhancements, because they read alike in a
numbered list and do not deserve equal billing: item 28 sat as "a counter
is wrong" while the indicator was quietly lying about whether the user's
work was safe to quit on.

Records two gotchas found by running the grep: item 12 lives in the
deferred table, which has different columns and no size, and a status
cell is prose rather than a keyword, so "open, on demand" and "open,
unspecified" both mean open.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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