feat(cli): colitur table and render

Computes and renders in one process. There is deliberately no stdin-fed
render: honouring the pipe would need a JSON parser we would have to
write, purely to serialise and immediately re-parse our own view -- a
second hand-rolled component and a second place for the contract to
drift, for no benefit. colitur emit --format json | jq still composes.

An unknown extension with no --flavour is an error naming the six valid
flavours, never a silent fallback to none: guessing wrong produces
malformed output that looks fine until it does not.

A malformed template reports the parser's own reason and exits 2. A
template is user input; it must never crash the program.

1 files changed, 69 insertions, 0 deletions

diff --git a/test/cli.t b/test/cli.t
index 9b3373a..73eefc1 100644
--- a/test/cli.t
+++ b/test/cli.t
@@ -484,3 +484,72 @@ day and readings are untouched:
 
   $ colitur readings 2027 | head -1
   2027-01-01 ef-circumcision | Titus 2:11-15 | Luke 2:21
+
+A minimal inline template renders -- table computes and renders in one
+process (2 January 2027 is a Saturday, not a Sunday, so Holy Name Sunday
+falls on the 3rd, not the 2nd, that year):
+
+  $ printf '{{#days}}{{iso}} {{slug}}\n{{/days}}' > /tmp/t.txt
+  $ colitur table --year 2027 --template /tmp/t.txt | head -2
+  2027-01-01 ef-circumcision
+  2027-01-02 ef-christmas-1-saturday
+
+render is the same operation under the name the design used:
+
+  $ colitur render --template /tmp/t.txt --year 2027 | head -2
+  2027-01-01 ef-circumcision
+  2027-01-02 ef-christmas-1-saturday
+
+Flavour is inferred from the extension and escapes data -- Sts. Peter &
+Paul (29 June) and its vigil are the only two 2035 entries whose English
+name needs LaTeX escaping:
+
+  $ printf '{{#days}}{{name.en}}\n{{/days}}' > /tmp/t.tex
+  $ colitur table --year 2035 --template /tmp/t.tex | grep -c 'Peter \\& Paul'
+  2
+
+An unknown extension with no --flavour is an error, not a silent fallback:
+
+  $ printf 'x' > /tmp/t.wat
+  $ colitur table --year 2027 --template /tmp/t.wat
+  colitur: cannot infer a flavour from ".wat"; pass --flavour latex|groff|html|xml|ics|none
+  [2]
+
+  $ colitur table --year 2027 --template /tmp/t.wat --flavour none
+  x
+
+An unrecognised --flavour value is also an error naming the six valid ones:
+
+  $ colitur table --year 2027 --template /tmp/t.txt --flavour bogus
+  colitur: unknown flavour "bogus" (want latex, groff, html, xml, ics or none)
+  [2]
+
+A malformed template is a clear error, not a crash:
+
+  $ printf '{{#days}}oops' > /tmp/bad.txt
+  $ colitur table --year 2027 --template /tmp/bad.txt
+  colitur: template /tmp/bad.txt: unclosed section {{#days}}
+  [2]
+
+A missing template file is an error:
+
+  $ colitur table --year 2027 --template /tmp/nope.txt
+  colitur: cannot read template /tmp/nope.txt
+  [2]
+
+table and render both require --year and --template:
+
+  $ colitur table --year 2027
+  colitur: table requires --year YEAR and --template FILE
+  [2]
+
+  $ colitur render --template /tmp/t.txt
+  colitur: render requires --year YEAR and --template FILE
+  [2]
+
+table/render's own flags have no effect on the other commands, refused
+rather than silently ignored:
+
+  $ colitur emit --format csv --from 2027 --to 2027 --year 2028
+  colitur: --year/--template/--flavour have no effect on `emit`; refusing rather than ignoring them
+  [2]